I loved my OnePlus 12. Ordered it the day it was released to replace my OP10 pro. Loved the phone. Until android 15 came out. Upgraded using their official upgrade link. Everything went perfect, so I thought. Turns out although it seemed like it was working, it would no longer make or receive calls using AT&T. I also noticed that about every 5-10 minutes, it would disconnect from the network entirely, so it was dropping the data connection to AT&T as well.
I researched and found others with the issue. OnePlus had an official link to downgrade back to Android 14, so I jumped through the hoops to do that, this time having to clear the entire phone. Problem is, after the downgrade, still no voice calling and data is disconnecting every 60 seconds and taking 30 seconds to reconnect. While driving, the phone wouldn't switch towers either. Has zero service until stationary for at least 5 minutes.
AT&T says it's a phone problem and I believe them, the SIM works in a different phone and a different working SIM changes nothing with the OP12. Searching online, it would appear multiple people are having this issue and OnePlus has pulled the android 15 upgrade down. When reaching out to OnePlus, their response is it could take a couple weeks to fix, yet there is nothing. So now I have a perfectly good OP12 that I loved but can't use and can't in good conscience sell either. It's now been three weeks of this nonsense.
So I bought a Pixel 9 Pro XL. Because it just works. Camera is same/similar, OS is snappy, I get that the SnapDragon might be a little more powerful, but honestly I can't tell.
Sadly, I loved OnePlus, but this may be the dealbreaker that causes me to never go back.
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