[Moto G7 Power Guides, News, & Discussion] MotoMan1955-5:
I've pretty much lost hope at this point but I might as well share some more of this madness I'm experiencing. Maybe you'll even get some amusement out of my struggles.

VoLTE continued to work with the stock ROM. I flashed LineageOS again last night and was pleased to see VoLTE still worked. It went fine all day until someone in person mentioned to me that they texted me yesterday but I didn't respond. I never received the text, and I tried sending them one and they had not received that either. Since I was on the stock ROM when that text had been sent, I figure it was something still incorrectly configured with the carrier. I tried messages to several other people. They would all say "sent" but only a couple actually made it to the recipient, and likewise I could not receive messages from most people.

When I got home, I switched the sims around in a couple of phones to narrow down whether it was my phone or my sim that was causing the issue. It turned out to be the sim, as evidenced by successful messaging with a different sim in my phone but not my sim in a different phone. I happened to have the SIM in the AT&T Callypso when I called ATT customer support to see if they could fix the problem. Ultimately they did. VoLTE worked. Messaging worked.

I switched the SIM back to the G7 (currently running LineageOS 18.1). I made a quick call to confirm VoLTE still worked. It did. Great success! Then right after that I got the dreaded message saying they're updating the network and the phone I was trying to activate will not work. Now, it drops from LTE to H+ any time I have an incoming/outgoing call again, and mobile data doesn't even work now. At least messaging works now.

To make things worse, now it isn't even automatically reprovisioning when I put the sim in a new phone so I can't automatically get those privileges back like I did before. To make it double-worse, the sim for my spare line got the same screwed up status from being inserted into the G7 that it now has the same troubles.

Blackhawk, I agree that they probably aren't witch hunting or intentionally making this difficult, but obviously its network is changing my privileges when I put the SIM card in this phone. It seems to be that switching a sim to a new phone sends that phone info to the carrier, and if they have it on their list they automatically adjust the types of services available to that line to fit the phone. I suspect that info it sends also includes some software info, considering how it worked as intended when I had the stock software but not with Lineage which it probably did not recognize. My best guess is that I got away with flashing Lineage yesterday because my line was already configured correctly from when I had the stock rom, and since the SIM didn't change with the Lineage flash, it kept that same configuration. Moving it to another phone and back made it see the G7 as a new phone again, and it sent the info but the software wasn't recognized so I didn't get the good privileges.

ffdm, unfortunately you seem to be correct about just getting the runaround if your issue isn't common. The tech support people don't seem interested in anything other than their pre-scripted instructions, and it doesn't help that the support has clearly been outsourced to another country so they are hard to understand.

I have one last hope which is to put the SIM into the G7 totally stock, call customer support and have them reset the provisions for this line, then flash Lineage again and hope it never triggers the automatic provisioning ever again.

I just want a phone with a long battery life and AOSP not bloated with spyware that sends all my information to third parties that profile me. It shouldn't be this hard.