Pixel 3a XL here on development channel. Cricket wireless. After mixing and matching multiple apn solutions to get mms working, I figured I'd share my fix. Hopefully it'll save someone the heartache I just went through, haha.

WIFI off

2g/3g/4g connection type

APN stuff. Modify existing two and save

-Cricket Internet-
Used for
Internet
Name
Cricket Internet
APN
Endo (think this was the main fix from default ndo)

-Cricket MMS-
Used for
MMS
Name
Cricket MMS
APN
ndo
MMSC
http://mmsc.aiowireless.net
Proxy
192.168.196.78

I believe changing the Cricket Internet to Endo helped with a conflict of both mms and internet being stock set to ndo? Not sure, but that was the last thing I tried before giving up, and it started working.
Hope that helps

Update: so after a couple days of struggle, it started working normally again? Hard reboots didn't help, I did those early on. So randomly decided to start working. Been good for several days now

@flohack I should clarify. Bluetooth pairs, but the audio is stuck on the phone's speaker, instead of the three BT devices I mentioned. I don't see an audio selection menu.
The only way I can resolve is by disconnecting and reconnecting manually. Ota 18 and 19 didn't have this behavior in the same use case

Is anyone else having bluetooth issues? My devices are set to connect automatically, and they do seem to, but the audio never switches over. I have to disconnect, then reconnect to get everything working.
My car, my bluetooth speaker, and my earbuds all have to be manually controlled.
I removed and re-paired to no avail

-pixel 3a xl

My thanks comes in the form of monthly payments to these devs. Since I have no skills to contribute XD

Also, to AsteroidOS team. Hope they haven't given up.

@mark1250 Oh interesting. I'll give your fix a try. Would be nice to have this little bug addressed, though

Does anyone else have issues with this device and the screen randomly coming on when it should be in standby? Ota 18/19 both do this on my wifi model

@melu9wuv I would go with red pocket's, but you may have a bit of testing ahead. Post any good fixes you find for others. Very niche problem that specific answers would be nice to find

@melu9wuv I would definitely look into your apn settings and how they apply in ubuntu touch. Maybe what worked for me would work for you? Loosely adapted principle of my fix, I doubt your apn settings would look the same as mine

Further update. With no changes, the access point now accepts me. I guess I was initially kicked for being a suspicious new device? Idk how those devices work. Stable now, though.

So with further testing, it seems you can swap ndo and Endo interchangeably between Cricket Internet and Cricket MMS, as long as they're one or the other, and not both the same.

Initial testing sees slightly faster speeds with ndo on Internet, but the ip address location isn't accurate. Which is actually kind of a good thing imo

Also, I changed the MMS entry to mirror the cricket website apn settings.

So my current loadout on Release Candidate branch is this

-Cricket Internet-
Used for
Internet
Name
Cricket Internet
APN
ndo

-Cricket MMS-
Used for
MMS
Name
Cricket MMS
APN
Endo
MMSC
http://mmsc.aiowireless.net
Proxy
proxy.aiowireless.net
Proxy port
80

Sorry if this is all total common knowledge, but I couldn't find a straight answer for my particular situation. Here are my findings. Hope they help someone

Further update. With no changes, the access point now accepts me. I guess I was initially kicked for being a suspicious new device? Idk how those devices work. Stable now, though.

So with further testing, it seems you can swap ndo and Endo interchangeably between Cricket Internet and Cricket MMS, as long as they're one or the other, and not both the same.

Initial testing sees slightly faster speeds with ndo on Internet, but the ip address location isn't accurate. Which is actually kind of a good thing imo

Also, I changed the MMS entry to mirror the cricket website apn settings.

So my current loadout on Release Candidate branch is this

-Cricket Internet-
Used for
Internet
Name
Cricket Internet
APN
ndo

-Cricket MMS-
Used for
MMS
Name
Cricket MMS
APN
Endo
MMSC
http://mmsc.aiowireless.net
Proxy
proxy.aiowireless.net
Proxy port
80

Sorry if this is all total common knowledge, but I couldn't find a straight answer for my particular situation. Here are my findings. Hope they help someone