No signal - Samsung Galaxy Note 8 Questions and Answers

Hi there,
I need help, trying everything find on the internet to fix this issue appears after last update with no success. After restart and few seconds later, signal goes down and dissappear completely. You can see only icon of no signal or disabled. With or without sim card is the same. Hard reset with no change.

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No Service icon displaying

So i have been using the phone fine with no problems in the last 2-3 months but today the phone is behaving very strange. The signal bar now have exclamation mark displaying so i click on it and it says 'no service' and i don't whats wrong with it. I tried soft resetting the phone several times but it still displaying. Solution for this problem is welcome, however i would want to prevent from hard resetting as i have a lot of software installed and i don't want to loose them or else it will take a long time to recover. Thanks in advance.
[email protected]
EDIT: Oops posted on the wrong section, sorry
does your contacts open up?
what programs have you ran or installed?

[Q] Failure to start external modem?

Hi everyone,
I have encountered a really annoying issue with my HTC One. It is a completely new replacement unit, and ever since I started using it I've had problems with the reception. In the beginning it only lost reception for a short while, and then regained it. Now however, the loss of reception is almost always followed by an immediate reboot, and after this reboot the phone often will not allow me to enter any pin at all. It will just show a "no reception" symbol in the status bar and subsequently reboot again after a minute or so. This boot loop continues until the phone actually allows me to input the pin again, after this the phone will work fine for awhile until this looping business starts anew.
I've actually tried a whole lot of different roms and radio versions in order to try to solve this issue, but to no avail. I've also used an RUU to reset my phones firmware from the very beginning, but the problem still remains. I've also tried to swap sim cards, no luck with that either.
I've tried to check the logs after these reboots, and the only things that seem to have anything to do with this are the lines: "failure to start external modem" and "MDM common shutdown".
Am I out of luck here? Is there anything I can do in order to try to fix this myself?
I'm afraid that if I hand it in for repairs the shop won't actually experience anything wrong with it, since this happens so randomly, and just send it back to me with a service fee.
Help is much appreciated!
Anyone? I've made a logcat log of the error tagged-messages that occurs right before a restart:
i.imgur.com/z5srdT3.jpg (I'm not allowed to post image-links since i don't have enough posts)
Bump.

[Q] Radio shuts off for ten seconds after every call

I'm running 4.3 rooted on ML2, stock ROM. Within the last week I started experiencing a strange problem - after every single phone call made or received, I lose all network connection for about ten seconds. I get the circle with the line through it. Going into settings shows actual connection drop, not just the icon. Then, the connection reappears. I've made no modifications since rooting it in April, nor do I recall removing or freezing any apps any time recently. Powering down and/or removing the battery has done nothing to help.
Any ideas what would cause this? I can't find any threads here, or through a google search, discussing this problem. Any help is appreciated.
Update - same problems when running in safe mode.
Well, this seems to have been a local network problem, as the issue has magically disappeared. Nothing exciting to report.
fullboogie said:
Well, this seems to have been a local network problem, as the issue has magically disappeared. Nothing exciting to report.
Click to expand...
Click to collapse
Remove SIM card and clean?
Yep - did every trick in the book. Even reflashed via Odin to be sure I didn't have a corrupted radio file. It just started working again. I"ve seen the same problem reported in other parts of the country, apparently the result of something AT&T was doing to the network.

Network bug on Nougat

So I have now, for the second time experienced this same bug. On a restart (just a normal one — not necessarily because the phone wasn't responding) the status bar completely resets to default: network name is shown, time switches to 12-hour clock etc.
However as in the image, the network type will be show ALL the time, even without mobile data being used. Obviously I don't mind that because it's actually kind of useful. But this is the symptom of a problem somewhere which causes the phone service to crash and reconnect if you try to open "Mobile network" in settings (second screenshot is it in the process of recovering)
Has anyone else experienced this or have any ideas how to fix it? I cleared storage for everything phone-and settings-related that it would allow, but it didn't help. Last time I had to do a hard reset but I don't want to have to do this all the time cause obviously it's not very convenient.

Freezes and restart... Died. What is the problem?

Hi guys since yesterday I have problems with my phone
the phone suddenly freezes over without being able to interact.
it restarts on its own but without ever starting the operating system in fact it shuts down and does not turn on again as if the phone had died.
the really strange thing is that the phone was fine Then suddenly he started making this mess.
Yesterday after so many hours of problems I managed to start the phone and now it works well but I am afraid that the situation will repeat itself.
the phone has the bootloader unlocked has root permissions, I followed the guides on this site.
But I have had this phone for two months now and these problems never occurred.
where can i start to understand what the problem is?
Mine suddently become all white, with the interface cut in half and moved up. i could do nothing. nor reboot nor shutdown.
after some minutes it turned back normal. i hope its color os bug and realme will fix it
It appears to be a firmware problem. We hope well.
Today did not give problems. This behavior is really strange, what can I install to understand the root of the problem?
I noticed that if the phone never goes into deep sleep mode the problem does not occur.
Now I am registering the log and as soon as the problem occurs again I go into detail to find out the real reason.
I'm trying to create an automatic script that is launched on the boot that practically never makes the phone sleep.
i'm really desperate the phone started to reboot itself.
I would like to try using a system log recorder but I realized that when I restart the phone these logs are not saved so it is impossible for me to verify the reason.
Can any of you help me out?
the phone freezes and then restarts.
Did you achieve any solution ?
No. I'm disperate.
Why don't you flash stock fw /recovery? Just to make sure it isn't an Hardware problem ?
I try but have this problem
https://forum.xda-developers.com/realme-x2-pro/help/bootloop-realme-x2-pro-rmx1931ex-t4089177
@westenlive
The problem appears only when you use data connection right?
If you try to switch off data and use wifi , you will not notice
The problem is because of the the operator, try another sim provider
Yes, in fact, that could be the problem because a few months ago removing the SIM card the phone did not give more problems
maybe you gave me the solution. I'll try
Ahmed Momtaz said:
@westenlive
The problem appears only when you use data connection right?
If you try to switch off data and use wifi , you will not notice
The problem is because of the the operator, try another sim provider
Click to expand...
Click to collapse
I am now testing the LINEAGE it happened to me this I removed the SIM card and I installed the costum Rom, I made the various customizations and the phone never locked OR restarted.
I inserted the SIM card in the phone worked perfectly, then having messed up with luckypatcher I had to reinstall the Rom.
So I performed the same procedure with the SIM card inserted in the phone and already at the first start it was unstable with reboots.
Currently I have applied for a change of sim card.
As soon as it arrives I will try to remove the sim card Install from scratch The system is to insert the new SIM card only so I can have the mathematical certainty that it is the SIM card
I hope my experience can help someone
This problem seems true, my X2 Pro also faced same issue when enabling cellular data. The phone sometimes loses the signal or the app freezes and perform a phone reboot. X2 Pro is a mid-range flagship phone, and yet this problem should be solved before they start to sell the phone.
Yes this device has many software problems but hardware problems of this kind are not acceptable.
Practically mine has become unusable, as soon as I turn it on after a few minutes of use it start closing the apps by itself.
Then after AN intende use of 30 minutes it start to restart.
This phone is truly incredible
Next time buy ONE PLUS

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