Unfortunately, I've recently had to switch back to Stock due to an issue I've been having receiving MMS messages. I'll describe it down below and provide what information I can. If anyone has any tips or resources to check out, or maybe some general advice, I'd love to hear it! Okay, so:
Various group chats have me missing messages. It seems to be unrelated to either iPhone or Android since the group chats contain users of both OSs.
I'm on T-Mobile and use a Pixel 9a. I tried Resetting Mobile Network Settings. I was doubly sure to disable RCS, and I've not had an iPhone at any point, so iMessage is a non-concern. I tried restarting the group chats by deleting them and sending them to a fresh one I made, to no avail.
I called T-Mobile and had them reprovision my line or whatchamacallit. That didn't help either, unfortunately.
Even more unfortunately, no one I know uses Signal or even WhatsApp. This is largely due to me living in the U.S., so carrier-based messaging solutions are substantially more common, so having the issues I've been having are felt more significantly and definitely need to be rectified.
I suspect the issue is largely related to RCS. When I asked my husband to show me the group chat on his phone so I could see what other users were seeing, some were flipping back to SMS, like when I messaged, and others were stuck with RCS switched on. My guess is that, with Google passing off more and more control of RCS to carriers, that it's more forcibly switched on? Something like that?
Either way, I flashed back to Stock and... immediately received all those missing messages and have experienced zero issues since. Sigh. I imagine this is, in part, too, connected to the fact that I use T-Mobile, but I'm grandfathered in on a great post-paid plan for cheaper than Mint, so there's a zero percent chance I switch, LOL.
Again, if anybody happens to have any experience with this or maybe some advice/suggestions, I'm all ears. GrapheneOS is a super cool project, and thankfully Stock has some pluses, too, it's just not quite as secure and certainly not as private. (At least my battery life will be better now and visual voicemail works again, haha!)
Thanks for reading my post!