There are 2 existing threads from last year for a different device about calls going directly to voicemail without the phone ringing even when the phone has good signal indicator and has not been moved. They seem to have gone cold but the issue persists or has returned for some of us. I've gotten in deep with AT&T and Motorola chasing a solution to recent occurrences of this on my AT&T Atrix HD. The next post here is a consolidation of my posts from those defunct threads and a whole lot of information resulting from contact with AT&T and Motorola, who may be viewing this thread.
I suspect that there are many possible causes for these symptoms and that my circumstance is quite localized however, if anyone else is experiencing this, particularly on the Atrix HD and AT&T please do post some details of the problem, as well the provider, model of phone and OS version.Thanks. ITM
On a new Motorola Atrix HD, in a well serviced area, with a full signal strength indicator and the phone having not been moved:
After a period of time (could be 30 minutes to several hours) although the phone shows full bars and a 4G connection, when a call is dialed from the phone it behaves as if it is not on any network and it re-initializes its phone network connection, going through the various icons and network types (no service, emergency calls, 4G ) until it gets to 4G and then the call goes out. While the phone is in that limbo state with full bars and 4G LTE icon it is receiving wireless waves (this is proven) but is not being given the proper command to switch to phone answering mode when a call comes in so the calls go straight to voice-mail and no alerts for missed calls or voice mails are sent to the phone... until the process of making an outgoing call from the phone forces it to re-find the network. Toggling data plan or airplane mode on/off also resets the phone network connection. Then incoming calls and voice mail alerts come through until the next instance. It is also possible that the phone is indeed on the network when the problem is in evidence and that some failure in the network signal or OS on the phone prevents it from changing state to answer the call. This has been happening several times a day for 3 weeks.
ATTEMPTED REMEDIES
- Data refresh (short of factory reset)
- Factory reset
- New sim
IN PROGRESS REMEDIES
- AT&T has forwarded this to engineers who will supposedly look deeper into the relationship between my phone and their service, and I hope, at particular slices in time where the incidents have occurred (I'm keeping a log of the incidents).
PLANNED REMEDIES
- Replacement phone. I will test the new phone before applying any available OS updates or installing apps.
ELIMINATED POTENTIAL SOLE CAUSES
- Disabling of certain native apps. Problem occurs regardless of which apps I have disabled and occurs with all native apps enabled.
- Phone being moved in and out of range. Problem has occurred and testing has been done at one location.
- Service outage at all towers within range. No significant degradation of service during problem incidents.
- Deep sleep mode. Phone goes into deep sleep mode properly and receives calls while in deep sleep mode when the problem is not in evidence.
- A particular app that can force phone to use 4G without LTE has been eliminated as potential cause, as the problem started before that app was ever put on phone and persisted for a week after factory reset and rebuild that did not include that app.
- Duration of idle time. The problem has been detected anywhere from 25 minutes to many hours after the phone was last used.
- Developer Mode USB Debugging. Problem occurs regardless of this setting.
Getting more granular:
For those having this issue on an AT&T 4G LTE phone this may be significant in determining the exact moment that the phone is failing to do something it should, which in turn may help get to the root cause of the problem.
- With data plan off and background data disabled the phone shows a greyed-out 4G LTE data network indicator without radio wave graphic elements. With data plan on it shows the same indicator not greyed-out and with radio wave elements.
- Under normal operation; When a call is placed to the phone (in this case from a land line), well before the ring is heard on the mobile phone and sometimes even before the ring is heard on the calling land line, the LTE part of the indicator turns off and then the call comes through. (The LTE indicator is also turned off when an outgoing a call placed from the mobile phone)
- Some moments after the call is ended the signal bars drop to zero very briefly then the LTE indicator reappears and the bars go back up.
- When the problem of missed calls/vms is in evidence the LTE part of indicator never goes off when a call is incoming and nothing short of manually toggling the network state of the phone seems to set it right
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ADDITION 3/12/13 relating to “Modem Fastdormancy Monitor Service”
- Under normal operation, when a call is placed to or from the mobile phone a process named “Modem Fastdormancy Monitor Service” is invoked. This process seems responsible for toggling the LTE component off during the call and back on when the call is complete, after which the “Modem Fastdormancy Monitor Service” closes its self.
- When the problem is in evidence the “Modem Fastdormancy Monitor Service” is never invoked, the LTE indicator never disappears and phone calls go straight to voice mail even though the phone is, in a technical sense, receiving wireless waves.
- When the phone is forced to use only 4G (instead of 4G LTE) the “Modem Fastdormancy Monitor Service” runs continuously and the problem does not occur. The app that allows this test to be performed has been eliminated as a possible cause.
So... it is at the point during an incoming call when the “Modem Fastdormancy Monitor Service” is supposed to be invoked but is not being invoked that the phone or network is failing to do something. Determining exactly what event invokes the “Modem Fastdormancy Monitor Service” may isolate the failure point and get to a solution.
Here is some hard tech detail about the “Modem Fastdormancy Monitor Service” found by a helpful Motorola tech.
http://www.faqs.org/patents/app/20120124196
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I’m curious to know if others are experiencing this.
Stock ROM, No Root, some reasonable apps installed
Model: Motorola Atrix HD MB886
System Version: 98.4.20.MB886.ATT.en.US
Baseband Version: MB886_BP_100740.071.65.04P
Kernel Version: [email protected] #1
Android Version: 4.1.1
State: NY
The snake eats its own tail
So...... the underlying issue is a problem with software in the Lucent switches that are part of the toggle mechanism that allows 4G LTE phones to use 4G LTE for data and 3G (although the phone indicator says 4G) for phone calls. This issue goes under-reported because it is less likely to occur when data is on all the time or the phone is traveling. As mentioned earlier in the thread it does not occur when the phone is forced to use 4G for data instead of 4G LTE.
Even though I am somewhat of an AT&T loyalist I was shocked at how poorly they handled this and at the amount of money they must be spending on chasing it while at another part of the company they knew exactly what the problem was.
At their supposedly highest level of escalation an AT&T representative could say was that another tower would be installed in my area within a few weeks. This was a preposterous non-starter of a notion precluded by weeks of troubleshooting by both me and AT&T, and even the AT&T representative who uttered it admitted as much before trying to blame the problem on the phone and trying to convince me to use a microcell. In that same phone call I was forwarded to a supervisor who described the issue with the Lucent switches and said an impending software update should fix it.
Good golly!
I can understand why providers make the mistake of over-committing to the new technology (as was done in the early 3G days) but this has been an unnecessarily grueling odyssey. Anyhooo, If anyone else is having this problem I recommend trying to force your phone to use 4G (without LTE) WCDMA, HSDPA.
Solution: Get out of AT&T contract and unlock phone to T-Mobile. Ironically, the WCDMA setting I used to work around this turned out to be a great battery saver and I still use it.
When I had an atrixhd I used to have this fail and never could do nothing because never found any type of solution or information , the only "solution" was set to 3G , because in 2G almost all calls to my phone were denied whithout advice, I ended up receiving a message for a miss call and it was with movistar México.
Sent from my DROID RAZR HD using XDA Free mobile app
Related
Has anyone else experienced this problem.
Although the phone shows it is connected to the Orange network quite often voice calls to the phone go straight to the voicemail, it seems that the phone is taking so long to process the call that the network assumes it is switched off and then diverts the call to the voicemail. a text then arrives notifying me of a missed call. Any ideas.
Incidentally I put the sim card back in my Artemis and everything worked OK
alanwesty said:
Has anyone else experienced this problem.
Although the phone shows it is connected to the Orange network quite often voice calls to the phone go straight to the voicemail, it seems that the phone is taking so long to process the call that the network assumes it is switched off and then diverts the call to the voicemail. a text then arrives notifying me of a missed call. Any ideas.
Incidentally I put the sim card back in my Artemis and everything worked OK
Click to expand...
Click to collapse
I too, seem to experience the same issue.. :\
It only seem to occurs after a while that the phone is in "extended sleep mode" (aka press the power key).
Now I'm trying a few things, I've switch the phone to GSM only network to see if THIS might be the issue... but if someone knows anything about this I'd be more than glad to be able to fix the issue
By the way my Kaiser is unbranded, the original HTC one!
You say you get a text re missed call, as opposed to a missed call notification. That would normally mean that the network couldn't see your phone - as normal internal missed calls (ie where you didnt asnwer) wouldn't send a text but would use an internal missed call counter.
So... do you have really weak 3g signal where you are and although the device thinks its connected, it isnt really?
Or is your device faulty...
unwired4 said:
You say you get a text re missed call, as opposed to a missed call notification. That would normally mean that the network couldn't see your phone - as normal internal missed calls (ie where you didnt asnwer) wouldn't send a text but would use an internal missed call counter.
So... do you have really weak 3g signal where you are and although the device thinks its connected, it isnt really?
Or is your device faulty...
Click to expand...
Click to collapse
Well I can say for me that the signal is always allmost full bars.
and I get txt msg saying either I have missed a call or that I have a new voicemail msg (Those are service provided by my carrier) So it's NOT "missed call notification" by WM.
So the network can't see your device when its trying to route a call to it...
Have you tried the device on GSM only? (settings, phone, band, change it from auto to gsm) to see if its a 3g network problem?
unwired4 said:
So the network can't see your device when its trying to route a call to it...
Have you tried the device on GSM only? (settings, phone, band, change it from auto to gsm) to see if its a 3g network problem?
Click to expand...
Click to collapse
Yeah that's what I mentionned earlier, so far it seems to be okay.
But what could cause this? The device switching between the networks?
I've got it as well, but I have to say I have experienced this on the Wizard also, and that's not a 3g phone. Also had it on the Universal, and that's why I used a Tornado for a year as it didn't occur on the smartphone version of WM5.
I had high hopes of such bugs being ironed out in WM6.
I use the power key to put it in standby, as I didn't want to leave the screen using power whilst it decided to go into standby by itself. Is this extended sleep/standby that I am activating the wrong thing to do? What should we do to get it into a light sleep?
Joe
joebongo said:
I've got it as well, but I have to say I have experienced this on the Wizard also, and that's not a 3g phone. Also had it on the Universal, and that's why I used a Tornado for a year as it didn't occur on the smartphone version of WM5.
I had high hopes of such bugs being ironed out in WM6.
I use the power key to put it in standby, as I didn't want to leave the screen using power whilst it decided to go into standby by itself. Is this extended sleep/standby that I am activating the wrong thing to do? What should we do to get it into a light sleep?
Joe
Click to expand...
Click to collapse
Well I dunno if it's cause by that, but this settings is located in the Power options of the setttings pannel... in the advanced tab you can tell it tu activate it or not and after how long u want it to *turn off the device* (which is what I call gently the "extended power saving")
Just spoke to Orange, apparently the 3G network went down yesterday this coincided with us getting the 3 tytn's so has probably made the problem worse. We were going to send the phone back under the 7 day return policy but have now decided to change them onto the gsm network as suggested by orange and see what happens when the 3G network re-appears.
I had the exact same problem with my Hermes on Orange about 14 months ago - just for a couple of weeks - as they were having network issues on 3g in my area.
3G masts are quite temperamental and if your local 3g provision keeps failing, they will replace them.
I haven't had any repeats of the problems for over a year.
The only annoying things about having to switch down to GSM are 1) no simultaneous data and voice, 2) slower surfing over GPRS and 3) you will get used to the massive battery life increase and switching back will hurt!
unwired4 said:
I had the exact same problem with my Hermes on Orange about 14 months ago - just for a couple of weeks - as they were having network issues on 3g in my area.
3G masts are quite temperamental and if your local 3g provision keeps failing, they will replace them.
I haven't had any repeats of the problems for over a year.
The only annoying things about having to switch down to GSM are 1) no simultaneous data and voice, 2) slower surfing over GPRS and 3) you will get used to the massive battery life increase and switching back will hurt!
Click to expand...
Click to collapse
Just now I had a second round of this problem at work, and I had the same thing yesterday here. Very f***ing frustrating and since the primary function of a phone is to make calls, it's particularly ****e that it doesn't do it well.
No calls and only one out of 6 SMS's were delivered. I had to do a soft reset and then I had two voicemails and 5 unread SMS's pop up.
If the calls/SMS's were retrieved after a soft reset does this mean that it's the phone and not the transmitter? I use my phone for work and this is becoming a real problem.
I can foresee this phone being off to HTC for 'repair' getting a new unit, flogging it and going back to WM smartphone edition.
No - it sounds like a network issue.
Switch to GSM for a week. Then switch back and it should be fine.
unwired4 said:
No - it sounds like a network issue.
Switch to GSM for a week. Then switch back and it should be fine.
Click to expand...
Click to collapse
Yeah, I did some searching on the subject and saw it occurred on many different WM phones, and switched it to GSM only.
It didn't fix it, and it simply wouldn't ring. I checked by calling from a colleague's phone and it displayed: 'warning active call divert on' or something like it.
I was most pissed off, as per my previous post.
When I got home, I activated (via network codes) call divert to my car phone number, then sent the cancel network code to deactivate it.
Tested via home phone and it rang. It was active (screen on) and rang withing one ring on the home phone. So I pressed the power button and tried it. Same result, imperceptibly slower if it was slower.
I work in a pre-fab unit made from corrugated steel on top of a hospital (obviously some sort of rapid office space 'solution'), and whilst I get 2 to 4 bars of 3G in there, and seeing the issues whilst on GSM only, I am totally and utterly confused as to the cause of the problem!
The Kaiser is however, on probation. For now
Cheers,
Joe
joebongo said:
Yeah, I did some searching on the subject and saw it occurred on many different WM phones, and switched it to GSM only.
It didn't fix it, and it simply wouldn't ring. I checked by calling from a colleague's phone and it displayed: 'warning active call divert on' or something like it.
I was most pissed off, as per my previous post.
When I got home, I activated (via network codes) call divert to my car phone number, then sent the cancel network code to deactivate it.
Tested via home phone and it rang. It was active (screen on) and rang withing one ring on the home phone. So I pressed the power button and tried it. Same result, imperceptibly slower if it was slower.
I work in a pre-fab unit made from corrugated steel on top of a hospital (obviously some sort of rapid office space 'solution'), and whilst I get 2 to 4 bars of 3G in there, and seeing the issues whilst on GSM only, I am totally and utterly confused as to the cause of the problem!
The Kaiser is however, on probation. For now
Cheers,
Joe
Click to expand...
Click to collapse
Hmmm really weird! keep us posted on your experiences
I'm having a hard time figuring out if i'm having a phone issue or is it a network issue that I need to get used to. Simple tasks such as navigation I can rarely get to work if i've already started moving. It will act as if searching for service for 2 or 3 minutes before it gets a lock and will begin navigating. I have had times with AT&T where I had little to 0 service and navigation would pick up fine, but with Sprint I see connection lost a lot more. Is this a Sprint thing or you think I got a bad phone?
I will have 3-4 bars of service on 3G and can stream music but refreshing something like Twitter can take several minutes or timeout completely. I live in Atlanta and have rarely seen 4G/LTE which I believe to be strange because Sprint's coverage map indicates they have strong coverage most of the places i've experienced the hiccups.
What do you guys think?
I think it's a phone issue. I have it as well. ...at least the "GPS lost" issue. Didn't have it with my note 2. I get fast GPS locks though.
No issue with data except for sprints typical slowness
Sent from my HTCONE using Tapatalk 2
I haven't had that issue but I don't live near anywhere as large a metropolitan area as Atlanta so that could be an issue. My GPS locks are nearly instant but I do have problems streaming music sometimes.
war eagle said:
I'm having a hard time figuring out if i'm having a phone issue or is it a network issue that I need to get used to. Simple tasks such as navigation I can rarely get to work if i've already started moving. It will act as if searching for service for 2 or 3 minutes before it gets a lock and will begin navigating. I have had times with AT&T where I had little to 0 service and navigation would pick up fine, but with Sprint I see connection lost a lot more. Is this a Sprint thing or you think I got a bad phone?
I will have 3-4 bars of service on 3G and can stream music but refreshing something like Twitter can take several minutes or timeout completely. I live in Atlanta and have rarely seen 4G/LTE which I believe to be strange because Sprint's coverage map indicates they have strong coverage most of the places i've experienced the hiccups.
What do you guys think?
Click to expand...
Click to collapse
I would call Sprint Customer care and tell them you are having issues with data services and that you have heard of this issue. Have them verify your UUIC ID number under settings/about/Phone identity. This is also the same as the SIM ID. They may say oh thats for international only but what they don't know yet is that number must match on your account for all your data services to behave properly. I figured this out after 6 phone exchanges.....the phone was fine....it was that number that was messed up.
My symptoms where:
- Slow data
- Dropped calls
- Radio was always using EvDo rev. A (check in settings/about/network)
- Never on EHRPD (Required for 4g LTE handoff with the towers)
- 104 data errors (these still happen but much less and is because they are still building out the 4g network here)
I hope this helps and will fix your issues. It did for me.
Cell tower information sometimes "Unknown" - Issues with Cell Near automation
Hi,
I have both tasker and automagic app profiles which are triggered based on cell tower informations. I discovered that altough my phone shows clear full reception signal and i can make calls, have data connection etc when i look via tasker or any other app that collects cell tower id's it gives a result of unknown. After a while this changes and the phone can again pick up actuall cell tower id's but it often switches back to unknown.
My issue with this is that this basically kills most of my location based automations on the phone and is driving me nuts.
Anyone else have similar issues with their HTC One and if yes know maybe a way to fix it?
Thanks
I may have found the problem (and the workaround). Since the HTC One is an LTE phone and my previous one (HTC One S where everything worked fine) wasen't i tried to change the Network mode from GSM / WCDMA / LTE auto to GSM / WCDMA auto only. Once i have done that the phone immediately was able to identify the cell tower network id. Of course this could be purely coincidental so only time will tell if this actually permanently fixes my issue but so far it seems to work.
I've seen a number of threads where people post about their device dropping network data connectivity, and needing a reboot to solve it.
My issue is a bit different. Occasionally (I've noticed it 3-4 times today) when I go to send a text (SMS) or to use a data enabled service like Hangouts, that my phone shows no bars at all.. not even just no data, but the bars are grey and there's a red x. I wait about 15 seconds and it reconnects, then another 10 seconds later, the data is live again.
Phone is a private sale and under 1 month old, and all the Stamina functions are off.. I do see that the "Queue background Data" is turned on, but I don't think this should effect, no?
Not sure what digits I should be looking at to know if this might be a hardware vs software issue.. build is listed as .93
Im no stranger to unlocking and flashing, but I've kept this stock cuz it's tight and I adore the battery life.
Suggestions?
sh0nuff said:
I've seen a number of threads where people post about their device dropping network data connectivity, and needing a reboot to solve it.
My issue is a bit different. Occasionally (I've noticed it 3-4 times today) when I go to send a text (SMS) or to use a data enabled service like Hangouts, that my phone shows no bars at all.. not even just no data, but the bars are grey and there's a red x. I wait about 15 seconds and it reconnects, then another 10 seconds later, the data is live again.
Phone is a private sale and under 1 month old, and all the Stamina functions are off.. I do see that the "Queue background Data" is turned on, but I don't think this should effect, no?
Not sure what digits I should be looking at to know if this might be a hardware vs software issue.. build is listed as .93
Im no stranger to unlocking and flashing, but I've kept this stock cuz it's tight and I adore the battery life.
Suggestions?
Click to expand...
Click to collapse
check in settings in network and set your network to the one you use , like gm/wcdma /lte , maybe your phone is strugling to find 3g or 4g , try it , who knows it might solve the issue , ty
Been about a month since I posted, and I'm still experiencing this issue. I often thumb my phone on and it's not connected. I don't really mind waiting for the 30 seconds or so that it takes to jump back on the network, but it often means I miss calls, and since it's my business phone, it kinda bums me out to suddenly get a VM notification of a missed call even though it never rang.
Is there some sort of utility that I can use to monitor the network activity to see how frequently it drops, and for how long? I've looked into ones on Play but they don't seem to have a history, just something that shows what data up and down is currently being reported.
Sadly the only Sony store in my city (and I think the country - Canada) has recently closed for good, so I'm not sure how to go about warranty repairs...
sh0nuff said:
Been about a month since I posted, and I'm still experiencing this issue. I often thumb my phone on and it's not connected. I don't really mind waiting for the 30 seconds or so that it takes to jump back on the network, but it often means I miss calls, and since it's my business phone, it kinda bums me out to suddenly get a VM notification of a missed call even though it never rang.
Click to expand...
Click to collapse
I don't have a solution, but I can tell you that you're not alone. I've been experienced the same thing on my Z3C. I sometimes wonder if it has anything to do with the fact that the MVNO I use doesn't support 4G LTE.
kopsis said:
I don't have a solution, but I can tell you that you're not alone. I've been experienced the same thing on my Z3C. I sometimes wonder if it has anything to do with the fact that the MVNO I use doesn't support 4G LTE.
Click to expand...
Click to collapse
Interesting.. Your issue isn't just data, but a complete network disconnection? Im with Fido which is an MVNO under Rogers, but I thought they supported LTE. The issue also persists even on wifi
sh0nuff said:
Interesting.. Your issue isn't just data, but a complete network disconnection? Im with Fido which is an MVNO under Rogers, but I thought they supported LTE. The issue also persists even on wifi
Click to expand...
Click to collapse
Yes, it seems to be a complete loss of the mobile connection. When I wake the phone I see gray bars and a red X on the signal strength indicator. Within seconds the phone re-acquires and the indicator goes to 2 or 3 bars. I have also seen it happen with wifi active. The frustrating part is that it doesn't seem to do it often enough to troubleshoot. I'll notice the problem maybe a couple of times a month and there's nothing obviously different about my usage patterns in those instances.
Mine does it at least a dozen times a day. I can only assume this as I frequently miss calls and at least 3-4 times a day I see it happen. =(
Same Problem
Randomly I have no connection at all but after a few seconds everything wents back to normal. Did not have this problem with T-mobile in Germany but with with O2 I have. With T-mobile I had LTE but with O2 I don't, so I guess that's the reason.
Interesting... I've disabled LTE and now have it on 3g/GSM. We'll see how it works moving forward, and I'll post again in a week. Stay tuned.
Service Providers
In the mobile network settings one can change the service provider manually. With LTE enabled my provider has three entries: LTE, 3G and 2G. Connecting two LTE fails, because my provider blocked it in my plan. Having LTE enabled, it often tries to connect to LTE I assume. I switched off LTE and set the provider manually to 3G. Maybe that helps. We'll see.
realTobbse said:
In the mobile network settings one can change the service provider manually. With LTE enabled my provider has three entries: LTE, 3G and 2G. Connecting two LTE fails, because my provider blocked it in my plan. Having LTE enabled, it often tries to connect to LTE I assume. I switched off LTE and set the provider manually to 3G. Maybe that helps. We'll see.
Click to expand...
Click to collapse
Interesting.. I have LTE as part of my network and plan... But once I made changes to the settings as I indicated, I no longer receive the network drops I originally experienced.. I might just be missing the alerts, but it seems fixed... #crossedfingers
I would like to share a peculiar trouble with my S10 that I purchased 8 days ago.
At my workplace, wherein I have been working for about ten months, I am now experiencing major trouble in calling with this phone - the person at the other end is never able to hear my voice properly - in every call!
But, outside of my workplace, this problem does not occur at all! Voice quality is amazing.
I went to the service center. One of the representatives immediately advised a factory reset and fresh installation of software from their system. I got that done, but the problem was still there. Very poor connection!
I went back and another representative gave me an advice which has solved my trouble magically! Now, the call quality is back to normal just like i get outide my workplace.
The advice given to me was to change the Network Mode from LTE/3G/2G to 3G/2G. He had said that this new phone has more bands than ever and that it is possible that my workplace environment does not support the new bands (sounds illogical). By the way, the signal bars still show 4G icon but not Volte/LTE like in the other network mode. (And my last phone, Mi 5, never gave me such a trouble)
Although the problem was solved, but i wondered that changing the mode from LTE to 3G will have a bearing on the data speed. I used Ookla speed test to determine that and yes, there is a major difference in download speed - it is less than half in 3G/2G network mode.
Can you please tell me if there is a trouble with my device harware or was the representative right?
LTE does require a much stronger signal than 3g and when you default to LTE the phone is probably just getting enough LTE to stay locked in to the signal. The LTE signal is getting knocked down in your building. Also HSPA+ will propogate better than LTE, even on the same bands.
Thanks for responding. In all this while I've done a lot of research. I managed to ask someone to come with their S10 to my office. The calls went through with this S10 without any hiccups whatsoever.
Also, I've been using the same network in this workplace on Mi 5 without any trouble. Also, there are many S9 and S8 users in my office. They have never had such complaints and they call on VoLTE.
Also, I tried two other networks and the problem persists.
Clearly, there is trouble with my phone. It is with the service centre now for diagnosis but they have been claiming that the problem lies with network in my area.
At the service centre there was another customer with Note 9 who complained of similar call drops but in random locations. The service centre simply did a fresh softwareinstall and sent him back.
My problem is that I will never be able to prove to them about call drops since the drops do not happen at the service centre.
I've had many occasions where I'm on the phone and the call drops. I try to pay attention to the screen as the 6T was pretty bad for that (I would face hang-up all the time) and it seems better with the S10 but I still get a fair amount of call drops. If I even attempt to hold the phone with my shoulder, it's almost guaranteed it will hang up as the proximity detector will enable the buttons.
Keep LTE enabled for data, but turn VoLTE off so calls switch to 3G/2G
Did you try to use a different sim card?