[LG V30 ROMs, Kernels, Recoveries, & Other Developm] br0adband:
I have no idea which device you actually own, sorry. But what I can tell you is this: if you have a carrier device for one carrier/network that's not T-Mobile and you're attempting to use it on a network like T-Mobile which now uses an app to do a device unlock then you're probably not going to get it working because that app checks the account info tied to the IMEI number of the device - if that IMEI isn't in T-Mobile's database aka it's not a device they actually sold themselves then it's not going to unlock it for you.

Your best bet - and again I'm saying this only because I have no clue what phone you do actually have - would be to convert it (presuming it's a V30) to the US998 like many of us have and that process should unlock it (carrier/network/SIM/etc) for use with any network. There is no logical reason to convert a non-T-Mobile V30 to an H932 using a ROM because it's still not technically going to be an H932; it will not get the Band 71 LTE 600 MHz working as I noted in another post. Only the actual H932 has Band 71 support and it cannot be added or "switched on" in any of the other models because they literally don't have hardware support for it in the cellular radios - only the real T-Mobile sold H932 can access that band.

Now, having said that, if you convert whatever V30 you have to the US998 that should unlock it completely and make it useful with whatever carrier/network/SIM card you want to use it with. There's nothing on the H932 that matters aside from T-Mobile carrier apps (and you can install those from the Play Market) other than perhaps the Wi-Fi calling feature for that carrier. I don't use T-Mobile's Wi-Fi calling because I'm on the $30/month plan with 100 minutes of talk time and if I do they'll take minutes away from me of that 100 I'm getting.

Having said that too I do use Google Voice and have for the past decade or so which means I've been using "Wi-Fi calling" the whole time - I only use my Google Voice number for everything, I don't ever give out my actual T-Mobile carrier number to anyone. My Wife has it, one of my relatives has it, and the 911/EMS dispatch in my area has it but that's it, other than T-Mobile itself nobody else has that number (can't use Google Voice for a 911 call if needed so that's why).

Anyway, if you had an actual real honest to goodness H932 you might be able to do all this without issues because the IMEI of that will be in their database automagically; a converted V30 turned into an H932 will not, so that device unlock app is more than like going to fail at the attempt to unlock it.

The US998 - even converted models turned into the US998 - has no such issues. My AT&T branded and sold H931 was not carrier/network/SIM unlocked when I got it - the previous owner did provide me with the actual AT&T provided unlock code but I never had to use it. I converted my H931 into the US998 using the very detailed and precise instructions here at XDA by ChazzMatt and others and I haven't had any issues since I did it the first time a few weeks ago. I even went back to it being an H931 recently - all the way back, even re-locked the bootloader because I wanted to test a few things on the native stock ROM - and the device remained unlocked for use with T-Mobile. I have still not actually used the AT&T unlock code at all, and yet my H931 converted to US998 remains unlocked at this time (it's back on the stock US998 20H of course).

I think we're taking this thread off-topic a bit too much but, I wouldn't bother with making any V30 model into an H932, I can't see any reason to do it personally. My converted US998 has Wi-Fi calling and it does work (I made one test call and used 1 minute of my 100 minutes), the hot spot works (without issues), and T-Mobile is my carrier so I'm good to go.

Good luck...