mobile data doesn't come up (fixed by unknown means)

[a1291762]

Everything was working fine on Friday.
I noticed on Sunday that mobile data wasn't up but I was in a low-signal area so didn't think much of it.
I can do calls and SMS, the data bearer just isn't coming up.
I've tried various resets, toggles, etc. I have had the phone off for several minutes. Nothing seems to help.
I got a logcat but it's not telling me anything.
Guides online don't seem to be written for people who know the difference between network registration and a data bearer.

Anyone have any clues???

 

[zsebtyson]

Everything was working fine on Friday.
I noticed on Sunday that mobile data wasn't up but I was in a low-signal area so didn't think much of it.
I can do calls and SMS, the data bearer just isn't coming up.
I've tried various resets, toggles, etc. I have had the phone off for several minutes. Nothing seems to help.
I got a logcat but it's not telling me anything.
Guides online don't seem to be written for people who know the difference between network registration and a data bearer.

Anyone have any clues???

Since the October update, mobile data speeds for me have been completely down. The 4g field strength is fine, but its actual speed is slowing down completely. I have a Xiaomi MI A2 Lite 3/32 phone. So far, I've had nothing wrong with him. It reminds me that battery usage has also increased since the upgrade. If read by competent, PLEASE fix this bug as soon as possible !!

 

[a1291762]

Since the October update, mobile data speeds for me have been completely down. The 4g field strength is fine, but its actual speed is slowing down completely.

It's not just slow, the bearer doesn't come up so the speed icon does not show.

I have the 10.0.14.0 fastboot image so I might try downgrading tomorrow. But it was working after the 10.0.15.0 update...

I got a "Phone" (dialer) update in Friday but I'd be surprised if that's part of data bearer bringup.

I've used modems in embedded systems before. I just don't know how the android stack works or where/if it logs more than logcat.

 

[a1291762]

Err... I have mobile data again.

Since I posted last night I left my phone in airplane mode overnight. It wasn't going this morning.

I did a power cycle and took the sim card out/in again. Once the system had come up my wallpaper was bad (something I have noticed occasionally from EdXposed). I rebooted and when the phone came up, my mobile data came up too!

Very confused.

 

[a1291762]

In case anyone else is trying to debug this... I came across a command I was not previously aware of.

It turns out radio events are separate from the main (default) logcat buffer, so you have to request them specifically.

logcat -b radio

Since my phone is currently working, I can only say that this seems to show extra details. I'll definitely give this a go the next time my phone stops being able to connect to mobile data.

 

[attila.lendvai]

all of a sudden my mobile data has stopped working.

it's with android 10, 2020 oct 1 update, and it appeared suspiciously close to the update (it's 11-11 now, and it started after a reboot).

below is the logcat -b radio of turning on/off mobile data, maybe it's useful for someone.

it's still not working for me.

damn, i'm denied posting the log... no external links for new users.

 

[a1291762]

all of a sudden my mobile data has stopped working.

Every time I do an OTA, I put my phone into airplane mode (so that the network does not come up/down multiple times) and I always do a power off and power on (not just a reboot) before I enable the radio again. I haven't had this issue again.

I would suggest putting your phone into airplane mode overnight. In the morning, turn it off and on (not just a reboot) and then enable the radio again.

If that doesn't help you can maybe DM me the radio logs? (I don't know if DMs can contain attachments)

 

[attila.lendvai]

I would suggest putting your phone into airplane mode overnight. In the morning, turn it off and on (not just a reboot) and then enable the radio again.

thank you very much!

it has finally worked for me, although i didn't keep it in airplane mode overnight, because i forgot it on (it was playing music on bluetooth... )

what i did:

• put phone in airplane mode
• shut down the phone (not just a reboot, that didn't help)
• restart after a few seconds