[T-Mobile LG G5 Questions & Answers] aquatic_snail_moss:
OKAY. So. The problem, in fact, had nothing to do with SIMlocking. It was trying to use a preinstalled T-mobile APN instead of the Ting APN.

One might think this would be the end of the problems, but it was not. I went in and manually selected the Ting APN. At this point I'm getting a normal LTE data indicator, and mobile data and SMS work, but phone calls still aren't. There are two separate Ting APNs, one for data and one for MMS. The one for MMS looked correct, but the one for data was missing information. Ting was supposed to send an automatic update to the phone to fix this, but although I was sent the message saying that they were sending it, it was not actually sent. So I went in to manually edit the APN according to these instructions:

APN settings for an X1 SIM card
Name	Ting Data
APN	wholesale
MMSC

http://wholesale.mmsmvno.com/mms/wapenc

APN type*	default,admin,fota,mms,supl,hipri,internet,dun
MCC	310
MNC	260
APN protocol	IPv4 / IPv6
APN roaming protocol	IPv4 / IPv6

Except I can't edit the Ting data profile. I can edit the SMS profile (though I don't want to, because it's not broken), and I can create a new profile, but I can't edit this one. So I think, okay, I'll make a new one and switch to that one. When I try to save it, it says my carrier doesn't allow profiles with the dun type, which is odd given it's in the default but I don't see why I'd actually need dial-up networking anyway, so I take that one out and save. It saves. I switch to that one. It switches.

I still cannot make calls.

Does anyone know why editing the data APN profile is locked, and how I can unlock it? Has anyone else had issues getting their carrier recognized by the new 19.1 LineageOS? What can I do to try to fix this? As much as I love the idea of never getting an actual phone call again, they are occasionally necessary.

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ORIGINAL TITLE AND POST:

H830 relocking (? maybe something else?) sim when LineageOS 19.1 is installed. Is there a fix?

I know there are already a million threads about trying to unlock H830s without access to the official app/with an ineligible phone/with a bad IMEI, etc. I have access to the official app and my IMEI clears just fine with my phone service provider. I'm... not hopeful, but given it is a different situation I thought it wouldn't hurt to ask.

Bought a phone sold as unlocked, then went through a convoluted process mostly following this guide (see my notes at the end) to get the bootloader unlocked and get Lineage 19.1 on there. At the stage with 15.1 unofficial lineage, it recognized my Ting sim card but seemed a little buggy, with fluctuating, mostly poor signal (as, honestly, one might expect from an early unofficial build). I didn't stay there long enough to investigate much further, but will do so later. At the stage with 19.1, it was locked to T-mobile again, though it also seemed to think my sim card was a T-mobile card, and allowed MMS but not calls. Knocked it back to stock 20A and used the app to "permanently" unlock it, which went without a hitch. Repeated the process, same result.

Is there any way to get this phone properly unlocked?

EDIT: The more I poke at this, the more I think the device really is unlocked properly now and something else weird is going on here. If it was just locked, my Ting SIM card shouldn't work at all and I should get some kind of alert about it, right? Instead the phone's listing T-mobile as my carrier and letting me send SMS, but not phone calls. Ting registers its existence as well, and I get signal on the signal indicator, just with a little "something is wrong" type exclamation point on it.