Pinephone(pro) modem bug / shortcomings

[MadameMalady]

I've noticed and been trying to debug an issue with the pinephone(pro)'s modem not reading sim cards properly, and I think I know what is happening, but not how to fix it, at all.

Disclaimer: I know jack-shit abt cellular modems and sim cards, so this is just a hypothesis from trial and error of swapping the sim card around.



The Issue:

A sim card that once worked perfectly can no longer make or receive calls in the Pinephone Pro on Mobian.



What I think is Happening:

When you get a nice shiny new pre-paid sim card and put it into your phone, it gets a tiny amount of info written to it, like the network provider, the phone's IMEI, etc.
I swapped the sim to my iphone once for a bit, which worked fine for everything from calls to texting and interwebs.
I than swapped the sim back to the Pinephone Pro, and I believe that the sim now has a new set of information on it that the Pinephone Pro's Modem doesn't fully undertsand.
The Pinephone's Modem now believes that the Mint Mobile sim card is in fact a T-Mobile sim card, and refuses to let me tell it otherwise and set the network to Mint.
It randomly alternates from displaying the network as 'T-Mobile' and 'Cellular' now.



Potential solutions(?):

Force the modem to wipe and re-write the sim card with fresh information every time it is re-inserted into the phone?
Is anyone else experiencing a similar bug?
Have you figured out a solution?

[WhiteHexagon]

Interesting. I recently bought a PP, but only just got around to testing a sim card in there last week. Actually it was a bit of a disaster since the phone did not ring on incoming calls (screen flashed briefly) (manjaro) or make any sound(dial tone?) dialing out. Anyway, I put the sim card back into my tp-link 4G router, and it kept trying to connect to the wrong network. What it calls the 'dial up setting'/ 'profile list' . I tried to change it back to the correct network profile, but it kept switching back to a non compatible network. I was thinking it was a bug with the router, but now you got me wondering if the PP wrote something to the simm, if that is possible?

[MadameMalady]

Interesting.  I recently bought a PP, but only just got around to testing a sim card in there last week.  Actually it was a bit of a disaster since the phone did not ring on incoming calls (screen flashed briefly) (manjaro) or make any sound(dial tone?) dialing out.  Anyway, I put the sim card back into my tp-link 4G router, and it kept trying to connect to the wrong network.  What it calls the 'dial up setting'/ 'profile list' .  I tried to change it back to the correct network profile, but it kept switching back to a non compatible network.  I was thinking it was a bug with the router, but now you got me wondering if the PP wrote something to the simm, if that is possible?

Yeah, I'm thinking it's a modem software bug on the phone, in my experience with Mint sim cards, buying a brand new sim and using it with *only* the pinephone seems to be fine, but the second you use the sim in anything else, the problems start.

**edit:
Actually, my wife reminded me I used it in one of her androids at some point, it was after putting it one of my iPhones that I remember it screwing up