Wow - you put a lot of thought in this - long story short - at the bottom I listed non mint APN settings which is working.
May I please start off that the factory phone works was not a swipe - I was attempting (hard to tell in text only) to report the facts as I have in hand without a full understanding. I apologize if that was taken as a swipe. I learned years ago if you can have a phone backup, have it while you sort items out with flashing (learned on One plus one “bacon” days).
With the published “official” Mint Mobile USA APN settings: The factory Pixel 4a phone does work, I am not able to get MMS working on the /e/ Pixel 4a (or stock lineage, I tried that too… I did not test Pixel Experience, crDroid, etc as they are not the base of /e/)
I knew something was off. It makes complete sense Google is possibly working with carriers (I guess they have a script to change APN’s without showing it in a program “black box”?). This is exactly what stumps me (or was something broken on the specific build, I had/have no idea)
I Always manually program in my APN settings. With that said, I never even entertained the pre programmed APN’s. I had some time to play late last night, I did not want to post until I had some information. I do not want to clog this thread with too much chatter without an intelligent update
.
Background: Mint was recently purchased by T-Mobile, I do not know any official date of any transfer. With that said I found and APN that works (I did not call, I tested different APN’s). The one that DOES work with Wifi on and off and outside of my house is the T-Mobile one already in 1.12 S Dev. (even tough I am on Mint Mobile mvno of T-mobile)
Both use MCC 310, MNC 260.
NOTE; Pixel 4a does NOT have the modem for 5g, therefore I am unable to confirm if working.
For the setting that I can confirm working right now. Pixel 4a/sunfish. /e/ OS version 1.12.3-s-20230617300623-dev-sunfish on Mint Mobile as of today 10 July 2023
(options not listed below is left blank)
APN: fast.t-mobile.com
MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc
MCC: 310
MNC: 260
APN type: default, supl, ia, xcap
APN Protocol: IPv6
APN Roaming: IPv4
Bearer: HSPA, EVDO_B, eHRDP, LTE, HSPAP, GPRS, EDGE, UMTS, IS95A, 1xRTT, EVDO_A, HSDPA, NR, HSUPA
MVNO type: none