Non-ATT Pixel 4a suddenly unstable network connection (voice and data) following June 2022 pixel update
I have a Pixel 4a bought from Amazon (unlocked) which has worked flawlessly on ATT's network since I bought it 13 months ago (1 month past warranty). Following a trip abroad where I used a foreign SIM for 3 weeks and during which time the June 2022 Pixel update was installed, when I reinstalled my ATT SIM the network reliability has been horribly shaky - wildly fluctuating connectivity to ATT network. Data speeds have been very inconsistent (ranging from fine/normal to almost unusably slow), but just as frustrating, in certain areas of town (I live in metro Atlanta), people cannot hear my audio (or it's so choppy they can't understand me) on phone calls, while I can hear them perfectly. It's not the mic hardware, because when connected to wifi and using Skype or FB Messenger, people hear me perfectly. I can always hear the other end of the phone, but they usually cannot hear me unless I"m in a magic area where the reception is perfect (even if it shows 4 full bars of ATT service.)
Here's what I've done to troubleshoot thus far:
- performed network reset
- installed new SIM card from ATT store
- performed factory reset (via Google tech's suggestion)
- cleaned microphone at local UBreakIFix store
- manually created 2 new nxtgenphone APN entries and let them populate for over 48 hours each
- Restarted via countless 'processes' that ATT tech support has pushed to my phone during 7-8 phone support sessions
- Ensured I have the most recent Android 12 update
ATT claims they've done all they can and that everything is fine on their end. Google says the phone hardware looks good. It's almost definitely a network-related issue, almost like the radio is having issues sending an outgoing signal (data or voice), but incoming is largely fine. And it only happens in certain pockets (most of Atlanta, as it turns out).
I've heard that since ATT has been decommissioning their 3G towers, non-ATT devices have sometimes struggled with network issues. This seems to be something like that, but no one seems to be able to identify a fix. Any suggestions welcome, as this is approaching the point where my 1-year old phone is becoming an unusable relic. Thanks.