Failure to Read SIM Card - G1 Q&A, Help & Troubleshooting

I have a recently-purchased used G1 that worked fine at first, and now fails to read SIM card.
The phone is rooted, SIM-unlocked, using Cyanogen Recovery 1.4, newest HSPL/Radio.
The problem occured intermittently at first, now almost always; with or without the SD card in, on several ROM's. The SIM card works on other phones.
My conclusion is that this is a hardware problem - I plan to revert to stock everything later to confirm this as most likely.
Any other suggestions as to what could cause this problem, solutions to try, or possible fixes for such a hardware issue?
Thanks

it has to be the hardware

I'm holding out on taking the phone apart until I'm sure I have no shot at getting original buyer to initiate a warranty replacement.
Has anyone tried to repair or replace this component?
Or does anyone know where I'd begin looking for the piece? (Apart from a more-cheaply-repairable busted-phone, i.e., with screen broken)

anwei40 said:
I'm holding out on taking the phone apart until I'm sure I have no shot at getting original buyer to initiate a warranty replacement.
Has anyone tried to repair or replace this component?
Or does anyone know where I'd begin looking for the piece? (Apart from a more-cheaply-repairable busted-phone, i.e., with screen broken)
Click to expand...
Click to collapse
Not that I'm aware of. A few people were successful in taking their phone apart and reassembling for the sake of cosmetic modifications and even as far as replacing the motherboard for those pesky spl bricks. In regards to the sim card reader... I couldn't tell you. Where did you buy the phone?
If it's ebay you might be able to return it and get a refund. If it's craigslist your SOL.

Related

Help, g1 keys broken

My g1 has not been working properly since i flashed JACHero2.1 something. They keys dont function properly like when I press end it either puts me at the lock screen or types 5u3i, there are several other keys that are broken too. I have tried new rom, radio and spl flashes and nothing fixes it. Any ideas what I could try next or what could have caused this?
have you tried a wipe?
restore from nandroid?
Hope you are under warranty
Call T-Mobile and just flat out be honest with them, minus the part about you flashing firmwares.. you will have a refurb that you really cant tell the difference from a new one on your way and at your doorstep for just the shipping and handling charge of $9.95 added onto your T-Mobile monthly bill.
I have done a wipe, not a nandroid yet I will look into that. Its sadly not under warranty I got it on craigs list.
I fixed it, thank you guys for the suggestions, the problem was in fact hardware related, I took the phone apart, which i must admit was the hardest phone to completely disassemble i have ever seen, and sprayed it down with electrical parts cleaner let it dry out and it now it works great.

Problem! Please help! G1 goes to sleep and doesn't wake back up.

I don't know what caused this.
I got my G1 today. It worked for probably 2-3 hours perfectly fine.
I had an app freeze (either Barcode Scanner or Lock 2.0) and had to do a full hard reset.
Now, whenever the phones screen darkens or I put it to sleep manually, it WILL NOT come back up.
I have factory reset three times now to try and get this to work.
When the screen is black, all buttons on the phone still light up and so does the LED indicator up top. I had my phone set to use a locking pattern screen at one point during one reset to test out and when the screen went black, I was still able to try and log in by doing my pattern. It unlocked, but still showed nothing on the screen.
Please help!
I've tried:
Turning Wi-Fi off
Turning 3g Off
Disclaimer: Yes, I've searched. I can find other users with the same problem but none of them seem to have a solution.
Phone is NOT ROOTED and has the factory ROM.
Update 1: Update: It only freezes/blacks out when I try to wake the phone from one of the front key buttons.
If I'm sliding to unlock, it seems to be fine.... (but if I've already tried to open from the front it doesnt)
Update 2: If I mash all the buttons in random orders for about a minute or two it seems to come back. Anyone have any idea?
Update 3: I'm thinking this has to be an issue with none of the buttons waking the phone up when closed. If I lock the phone with the "END" key, and then click the front "END" Key again, nothing happens. If I slide the phone open, and click it twice - the phone wakes up.
Update 4: Confirmed update 3. Phone will not unlock via front keys unless it's slid open (or open enough to trigger).
I would really, really appreciate help with this.
Hate to bump this, but I've added some detail on the top and bottom. Have to leave for work, hopefully someone might have an idea by the time I get back.
Well you can try to reload the factory rom or root it and try a custom rom and see if the problem still exist. If it is still happening then it would be a hardware problem and need to be sent in. And yes you will still be covered under warranty with HTC since the phone is still less than a year old.
I had a problem with exactly the same symptoms. It turned out that the SD card was cocked-up so home, core, and some other process would hang trying to read it and the phone would not wake-up the screen any more.
Did you try removing the SD card and seeing if that helps?
Karolis said:
I had a problem with exactly the same symptoms. It turned out that the SD card was cocked-up so home, core, and some other process would hang trying to read it and the phone would not wake-up the screen any more.
Did you try removing the SD card and seeing if that helps?
Click to expand...
Click to collapse
Removed the SD card and rebooted the phone.
No change ( still acts the same way ).
Did you factory reset after or was it an instant change?
I don't mind losing data to fix this.
supremeteam256 said:
Well you can try to reload the factory rom or root it and try a custom rom and see if the problem still exist. If it is still happening then it would be a hardware problem and need to be sent in. And yes you will still be covered under warranty with HTC since the phone is still less than a year old.
Click to expand...
Click to collapse
Wouldn't I have to root to reload the factory rom? Is there a rooting tutorial based just on that?
zeabrid said:
Wouldn't I have to root to reload the factory rom? Is there a rooting tutorial based just on that?
Click to expand...
Click to collapse
If you use the official update you don't have to have root. There are some links on here. I'll see if I can find it for you.
https://android.clients.google.com/updates/signed-gfh-CRB43-from-CRB21.c88b03d2.zip
That should be it, but can't confirm since I'm on my work computer.
Some thoughts--may be useful, or not:
Mine was doing that too, but it was caused because I dunked mine underwater during an urban exploring mission. I dried it out, replaced the LCD screen, and everything worked until it would go to sleep. Then I had to do a variety of button mashes and opening the keyboard to get it to come back to life. Sometimes it just wouldn't come back. The problem grew worse over time.
If wiping and reflashing (no need to use a stock ROM) gets you nowhere, then I would suspect a deeper hardware issue. I see you bought it used, can you contact the seller?
If you want to check for water damage, take out the battery and look at the tiny circular sticker in the battery chamber--if it is not white, it has been water damaged. (And the warranty will not be honored.)
Other Lesson: No urban exploring with G1s.
The link didn't work, btw.
derfolo said:
Some thoughts--may be useful, or not:
Mine was doing that too, but it was caused because I dunked mine underwater during an urban exploring mission. I dried it out, replaced the LCD screen, and everything worked until it would go to sleep. Then I had to do a variety of button mashes and opening the keyboard to get it to come back to life. Sometimes it just wouldn't come back. The problem grew worse over time.
If wiping and reflashing (no need to use a stock ROM) gets you nowhere, then I would suspect a deeper hardware issue. I see you bought it used, can you contact the seller?
If you want to check for water damage, take out the battery and look at the tiny circular sticker in the battery chamber--if it is not white, it has been water damaged. (And the warranty will not be honored.)
Other Lesson: No urban exploring with G1s.
Click to expand...
Click to collapse
Zero water damage.
That's great news zeabrid! In that case, I agree with an earlier poster--you should be covered by warranty. Wipe and flash a good rooted rom, and if that doesn't work, revert to stock and demand a new phone.
derfolo said:
That's great news zeabrid! In that case, I agree with an earlier poster--you should be covered by warranty. Wipe and flash a good rooted rom, and if that doesn't work, revert to stock and demand a new phone.
Click to expand...
Click to collapse
Do you have a link to a guide that teaches how to do this (with the stock rom)? I can only see a few that're spread out.
I'm not entirely sure my phone can boot into safe mode/disk mode, so we'll see about that.
Another update: When I boot into safe mode, the same problem exists.
Edit: Just emailed HTC.
This can officially no longer be considered a software issue.
I just rooted and installed a standard ROM. Same issue.
It happens all the way at boot now, just realized this.
HTC emailed me back and told me to call them directly. Will do that tomorrow.
if I find a solution I'll post it immediately.
Alright, my phone is officially ****ed.
Restored back to the original rom.
New problem now: When I close the screen, the backlight goes out and doesn't come back on. (I can still barely see everything, but there's no light).
Calling HTC today.
Edit: Called T-Mo support. They suggested deleting programs to free up space (I only have 2 downloaded and to reset (already done)
=(
Edit2: Called and placed a RMA with HTC after talking to two of their customer support reps. Thankfully, they forwarded me up the support tier after only about a minute with each person when they realized I had already tried all other steps.
The RMA process was surprisingly easy. I have everything set up, and when I get paid (tomorrow) I'm going to ship the phone out. I was given an estimation of 7-10 business days for full repair and return shipping (which sounds great in my opinion - I've never sent anything in for warranty work before).
I'll update you guys once I hear from their repair team on whether or not I'm going to be covered under warranty (I told them that the phone was a gift to me), and if not what the cost is going to be. Like I said earlier in the thread, all water damage indicators are clear and I have unrooted my phone, so I should be covered hopefully.
Thanks to anyone who posted in this thread.
zeabrid said:
Alright, my phone is officially ****ed.
Restored back to the original rom.
New problem now: When I close the screen, the backlight goes out and doesn't come back on. (I can still barely see everything, but there's no light).
Calling HTC today.
Edit: Called T-Mo support. They suggested deleting programs to free up space (I only have 2 downloaded and to reset (already done)
=(
Edit2: Called and placed a RMA with HTC after talking to two of their customer support reps. Thankfully, they forwarded me up the support tier after only about a minute with each person when they realized I had already tried all other steps.
The RMA process was surprisingly easy. I have everything set up, and when I get paid (tomorrow) I'm going to ship the phone out. I was given an estimation of 7-10 business days for full repair and return shipping (which sounds great in my opinion - I've never sent anything in for warranty work before).
I'll update you guys once I hear from their repair team on whether or not I'm going to be covered under warranty (I told them that the phone was a gift to me), and if not what the cost is going to be. Like I said earlier in the thread, all water damage indicators are clear and I have unrooted my phone, so I should be covered hopefully.
Thanks to anyone who posted in this thread.
Click to expand...
Click to collapse
Yea it defitenly sounds like a hardware issue and needs to be fixed. Glad your getting it fixed and you'll be covered no problem.
Do you know if they charge return shipping if it's covered under warranty? I have to pay my own shipping there, and they had me put a credit card down on file in case I either bail when its already there or they need to charge for repair.
zeabrid said:
Do you know if they charge return shipping if it's covered under warranty? I have to pay my own shipping there, and they had me put a credit card down on file in case I either bail when its already there or they need to charge for repair.
Click to expand...
Click to collapse
To be honest I don't know the answer but would like to say they would pay for it. But they would have to let you know of the charge before they apply a charge to a credit card.
wow its weird cause im just having a similiar issue now.. in landscape mode.. phone and back light work perfectly. but one i close the screen everything goes virtually blank, everything is running perfectly just the screen light wont turn on..
will try some of your previous methods.. hopefully it works on mine..=/
thanks, for the info zeabrid

[Q] Question for Anyone who Sent in a Bell I9000M for repair

I guess I'm one of the unlucky ones who has to send this phone in for repair.
Going there this morning..
My question is to those that have received their phones back. Any indication that the repair done has anything done different to the phone?
I mean, if they are just replacing the defective guts with essentially the exact same guts but working, does that not mean it will just happen again (SD Failure)?
Or did they actually change something within the phone to make it more durable and essentially eliminate what brought it to them in the first place?
Hopefully someone in the know could answer this... pointless to repair something with another soon to fail board or sd card.
that is a very good question, of all the phones i sent in for repair and got back
they kept their original IMEI numbers
they all came back with replaced PCB (motherboard) and cause of failure is "No Power"
by that i figure out they mean, it does not charge when you plug in the USB cable to the phone after it dies.
it seems like whatever controls the internalSD also controls the USB charging of the phone
so the problem might not really be with the internal SD but rather the power relay that supplies power to the internal SD and battery charge.
greeced said:
I guess I'm one of the unlucky ones who has to send this phone in for repair.
Going there this morning..
My question is to those that have received their phones back. Any indication that the repair done has anything done different to the phone?
I mean, if they are just replacing the defective guts with essentially the exact same guts but working, does that not mean it will just happen again (SD Failure)?
Or did they actually change something within the phone to make it more durable and essentially eliminate what brought it to them in the first place?
Click to expand...
Click to collapse
This is a great point allgamer.
However fact still remains... if they are swapping out the guts for identical, but working internals, that defeats the purpose of actually correcting the problem as the problem will surely pop up again.
Lets hope it doesnt.. but this phone doesn't seem like a good candidate for constant flashing the way my old HTC Touch Diamond was. Especially if you're doing it with ODIN, you may not have a leg to stand on come out of warranty claims.
At least if you flash something with KIES, because it was an "official" update provided by samsung. So if the phone goes corrupt, you can yell to the heavens and they'd have to fix it, because essentially they corrupted your phone.
It would be great to get some feedback from other members who received their phone back from repair. I wonder if one of those members had the SD go corrupt again with the new Motherboard in place.

[Q] HTC One SIM Slot pin broke :(

So, it's stupid situation, and as i searched i'm not the first who have the same problem. So nano sim adapter got stuck in my phone aand when i was trying to get it out (alredy did) i broke something inside, when i shake phone i can hear it. I tried to look into the slot, i saw all 3 pins on their places (idk what i broke down) but still, when i insert sim it says no sim. On miui rom when I inserted sim it said no service (so is it alive?)
but after turning airpalne on/off it said no sim again.
I think when i tried to remove stucked adapter it lowered pins and they don't reach sim.. So the worst part now is teardown. Found video, http://www.youtube.com/watch?v=3hORFjKVr18 looks easy, but this phone was never disassembled, so the glue is strong. Also, new sim flex costs 4$, but i afraid to make it even worse.
I have a warranty, but it's from another country, but it should be accepted here. But will they repair, since it's my fault?
And any ideas how much replacement will cost?
No one responded. ookay.
So i installed viperx rom, when i insert sim nothing happens, when i remove it - "Sim card not detected" - "make sure that your sim is prorerly inserted"
So it's definately alive. I need to make better contact or somehow pull up pins.
Today tried to remove back cover with no success. Goes really hard and i left scuffs around housing.
So still i didn't get answer about warranty. Is this case under warranty?
Should i send it to official htc service?
okay. I disassembled my htc one. ^^
One thing left to do: remove screen to get that f*cking sim reader.
_RiVeRsIDe_ said:
okay. I disassembled my htc one. ^^
One thing left to do: remove screen to get that f*cking sim reader.
Click to expand...
Click to collapse
You shouldn't have done that. That completely voids the warranty. HTC might have covered the SIM tray replacement under warranty. Make sure u re-assemble the phone properly
raghav kapur said:
You shouldn't have done that. That completely voids the warranty. HTC might have covered the SIM tray replacement under warranty. Make sure u re-assemble the phone properly
Click to expand...
Click to collapse
i have unlocked bootloader, also it's my fault a bit. I have sent them email, but they haven't answered. Also nearest HTC center is in another country
I saw an almost complete housing (black or silver) on e&ay. Front (digitizer), back and simtray for a reasonable price (~38 usd incl. shipment).
It's a lot of work, but would restore your device in new condition.
it's possible to change sim slot only which costs 4$.
But there is no lcd and sim slot? I don't need it then.
Maybe someone knows , is sim slot soldered to phone? because i can see a flex and wondering how to remove it.
It was just glued. Now i'm going to order new adapter.

No Sim Card - Emergency Calls Only Error on Verizon

Mostly just browse these forums, and as you can see, don't post often.
Since about 2 weeks after I got my Nexus 6 directly from Motorola, I've been having intermittent issues with my sim card. It varies wildly in time frame. Longest I've gone without the message popping up, and losing connectivity is about a week and a half. I shut the device down, restart, and it's back. Sometimes it happens as frequently as within the same 5 minutes. As you can guess, I'm highly irritated.
First, I called Verizon and they were nice enough to send out a new nano sim. Popped it in an adapter, activated in Galaxy S3, and into the Nexus. Didn't solve anything, but at least I can rule out a faulty sim card.
Second, called Motorola to ask for a replacement. 5 business days later I call to ask where my phone is and I'm told that they don't have any "like-new" stock and that they don't know when they will. I ask for a refund to buy another phone and they say it will be 4-6 weeks.
Can someone smarter than I tell me if this is for sure a hardware issue? I'm guessing it is, and that it's specific to my device since I literally can't find anything on the web/forums about others having this issue with the N6.
Help is much appreciated, thanks.
Check your apn settings
provide more info, are you stock, custom rom, unlocked, etc.
You may need to try a nuke and repave to start fresh. After a week, something happened to my SIM on a custom rom and the fix is to nuke and repave and that includes userdata.
so back stuff up but only restore what you seriously cant redo, thats working so far for me.
GL
Can you advise what to check in APN's? (Sorry for the dumb question)
I was rooted running stock rom for a week, but unrooted and factory reset when I thought I was returning it to Motorola. Has had issues both ways.
Try hitting the contacts on the sim card with a pencil eraser.
mrbrooks .. i have a nexus 5 and i have this exact same problem .. leads me to believe maybe its software related .. started after lolipop .. havent been able to find a solution yet !
jeetash said:
mrbrooks .. i have a nexus 5 and i have this exact same problem .. leads me to believe maybe its software related .. started after lolipop .. havent been able to find a solution yet !
Click to expand...
Click to collapse
nexus 5 doesnt work on verizon(not fully at least). the op said that he ordered a replacement, which sounds like you should do, as the nexus 5 did have an issue with coming with a bad sim card holder on occasion.
simms22 said:
nexus 5 doesnt work on verizon(not fully at least). the op said that he ordered a replacement, which sounds like you should do, as the nexus 5 did have an issue with coming with a bad sim card holder on occasion.
Click to expand...
Click to collapse
worst part is that it is happening on an Replacement device after i RMAd my first nexus for a power button problem !!
i hope its software related and can be fixed .. because google is now refusing to rma this as im now out of my warranty period !
just to be clear im not on verizon .. im on a gsm carrier and have tried 4-5 different working sims
it latches on to network and works fine for a few hours and then just drops and refuses to catch networ k...
any other ideas ??
can the bad sim card holder be fixed or repaired ??
Did this ever get figured out for any of you? I have the same issue on a Nexus 6. It won't read my AT&T SIM card at all anymore, but knows it's in there. When I put in a Verizon SIM card, it see the card and updates information in the status section, but still says No Sim Card at top of screen. I am currently in the middle of getting a replacement from Motorola, but now I am worried this will happen on my next one too.
Ryououki said:
Did this ever get figured out for any of you? I have the same issue on a Nexus 6. It won't read my AT&T SIM card at all anymore, but knows it's in there. When I put in a Verizon SIM card, it see the card and updates information in the status section, but still says No Sim Card at top of screen. I am currently in the middle of getting a replacement from Motorola, but now I am worried this will happen on my next one too.
Click to expand...
Click to collapse
This just happen to me as well, google knows nothing about it, neither does motorola , they are sending me a replacement hopefully that fixes the issue.
I just got out of the shower and suddenly had the "no sim card" message. Restarted the phone, still nothing.
Removed the sim card. Put it back in... Now I have data again. Wtf?
I just noticed this running chroma. It always happened on boot and always went away. Never seen it stock unlocked rooted and tweaked with things like the Motorola command center, tethering, and such.
I have just got a N6 today and mine seems to be doing this. Have you guys had yours replaced?
Eager to know if i need to send it back or if its software. The sim card works fine in my s5.
EDIT: it looks like I can make it do it. If i type really quick , the vibrations/haptic feedback must make it have a poor contact and it disconnects.
f1ux said:
I have just got a N6 today and mine seems to be doing this. Have you guys had yours replaced?
Eager to know if i need to send it back or if its software. The sim card works fine in my s5.
EDIT: it looks like I can make it do it. If i type really quick , the vibrations/haptic feedback must make it have a poor contact and it disconnects.
Click to expand...
Click to collapse
I am curious, have you guys figured out this issue? I just got a new Nexus 6 that does this intermittently. The phone can read the card, but then every once ina while (about three times a day) it says 'no sim card - emergency calls only'.
I've noticed that banging mine against a hard surface (I do have a case on) seems to fix it for me, as horrible as it sounds... Mine does not fix itself after a reboot.
That said, it hasn't happened to me since I've had marshmallow on here.
In short. I have no idea what's going on.
Sent from my Nexus 6 using Tapatalk
I have had my replacement Nexus 6 for about 9 months and have not had this issue occur on the replacement unit. I'd highly suggest sending it in for replacement if you are still under warranty.
Sent from my Nexus 6 using Tapatalk
Push the SIM tray in really hard!
Push the SIM tray in as hard as you can!!!
I tried every other solution and this worked for me with Nexus 6.
I have same issue No SIM CARD with droid turbo, restart always solve issue, its common problem with Motorola phones, lot pf people are facing this but no solution yet
yeah my shamu after a new sim card did this, took it in, no fix, mytrendyphone service in england claimed they could fix it,, I paid they didnt fix it, kept it two months, sent it back unrepaired.
yes fairly ticked off. wifi only paperweight now.
MrBroox said:
Mostly just browse these forums, and as you can see, don't post often.
Since about 2 weeks after I got my Nexus 6 directly from Motorola, I've been having intermittent issues with my sim card. It varies wildly in time frame. Longest I've gone without the message popping up, and losing connectivity is about a week and a half. I shut the device down, restart, and it's back. Sometimes it happens as frequently as within the same 5 minutes. As you can guess, I'm highly irritated.
First, I called Verizon and they were nice enough to send out a new nano sim. Popped it in an adapter, activated in Galaxy S3, and into the Nexus. Didn't solve anything, but at least I can rule out a faulty sim card.
Second, called Motorola to ask for a replacement. 5 business days later I call to ask where my phone is and I'm told that they don't have any "like-new" stock and that they don't know when they will. I ask for a refund to buy another phone and they say it will be 4-6 weeks.
Can someone smarter than I tell me if this is for sure a hardware issue? I'm guessing it is, and that it's specific to my device since I literally can't find anything on the web/forums about others having this issue with the N6.
Help is much appreciated, thanks.
Click to expand...
Click to collapse
OK first off I had the same issue. intermittent no sim detected. go worse and worse, until did not detect at all...
First I placed a piece of this card stock behind sim and jammed it into the slot. that worked for a bit and the again it started with the same issue.
and became a pain again...
(FYI, I am an electrician by trade)
What I has appeared to fixed it permanently (so far anyway).
All electrical contacts get a corrosion (a patina layer) some more than others from humidity, sweat, dissimilar metal touching, or just cheap metal..
On a hunch I gooped up the sim contact surface with a de-ox compound (De-oxidation) and worked the sim in and out a few time to "clean the contacts (you could use a small long skinny piece of paper board to to it also (I didn't think of it until after) and insert the Sim. So far it has done the trick.
the is many de-ox compound available (home depot or electrical supply)so are blacking and gritty. what I used was ilsco Non- grit De-ox Compound".
I hope this helps as this seem to be a pretty common issue.
As always, Your actual mileage may vary.
---------- Post added at 06:28 PM ---------- Previous post was at 06:01 PM ----------
MrBroox said:
Mostly just browse these forums, and as you can see, don't post often.
Since about 2 weeks after I got my Nexus 6 directly from Motorola, I've been having intermittent issues with my sim card. It varies wildly in time frame. Longest I've gone without the message popping up, and losing connectivity is about a week and a half. I shut the device down, restart, and it's back. Sometimes it happens as frequently as within the same 5 minutes. As you can guess, I'm highly irritated.
First, I called Verizon and they were nice enough to send out a new nano sim. Popped it in an adapter, activated in Galaxy S3, and into the Nexus. Didn't solve anything, but at least I can rule out a faulty sim card.
Second, called Motorola to ask for a replacement. 5 business days later I call to ask where my phone is and I'm told that they don't have any "like-new" stock and that they don't know when they will. I ask for a refund to buy another phone and they say it will be 4-6 weeks.
Can someone smarter than I tell me if this is for sure a hardware issue? I'm guessing it is, and that it's specific to my device since I literally can't find anything on the web/forums about others having this issue with the N6.
Help is much appreciated, thanks.
Click to expand...
Click to collapse
I know this is an old post,.. but I'm answering in hope of helping others that my need the solution
OK first off I had the same issue. intermittent no sim detected. got worse and worse, until did not detect at all...
First I placed a piece of this card stock behind sim and jammed it into the slot. that worked for a bit and the again it started with the same issue.
and became a pain again...
(FYI, I am an electrician by trade)
What I did next had appeared to fixed it permanently (so far anyway).
Many electrical contacts get a corrosion (a patina layer) some more than others from humidity, sweat, dissimilar metals, or just cheap metal..
On a hunch I gooped up the sim card's contact surface with a de-ox compound (De-oxidation) and worked the sim in and out a few time to "clean the contacts" inside the sim slot (you could also use a small long skinny piece of paper board to to it also (I didn't think of it until after) and insert the Sim. So far it has done the trick.
the is many de-ox compound available (home depot or electrical supply)so are blacking and gritty. what I used was ilsco Non- grit De-ox Compound".
The compound will not (should not) damage and the phone, its is for electrical and electronic equipment.
I hope this helps as this seem to be a pretty common issue.
As always, Your actual mileage may vary.
Veronica

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