[LG V30 Questions & Answers] TheDannemand:
Hi again, @ChazzMatt

I apologize for leaving this one hanging, but I finally have an update.

In short, I got the Verizon service from InfiMobile working, with some caveats. Following are details for those who may be interested:

1) The SIM came fast and had to be activated on the InfiMobile website, using a compatible IMEI. As expected, neither of my US998 units (formerly LS998) were accepted, but a neighbor's old iPhone was warmly welcomed -- how could VZW ever say no to an iPhone user 🙄 I chose a new number for this test, but plan to port in my Red Pocket number if I stay with InfiMobile.

2) Once the SIM is activated, LTE/SMS/MMS works on my US99830b (Pie). VoLTE does NOT work for outgoing calls, but strangely DOES work for incoming. As broadly reported, VoWiFi (WiFi Calling) doesn't work either. Hidden Menu says IMS NOT registered (*#546368#*998#). Phone info (Testing menu) says VoLTE & VoWiFi NOT provisioned (VZW blocks *#*#4636#*#*, but it can be opened with com.android.settings.RadioInfo). Despite much trying, I have NOT been able to make VoLTE work for outgoing calls; and I do miss VoWiFi, as I usually use AirPlane Mode with WiFi enabled when home in order to save battery.

3) I wanted to try VS996 Pie ROM, but had a VERY hard time flashing it on my other LS998, which was still on US998 Oreo. Always bootlooped. Same problem trying to flash US998 Pie. I tried every conceivable setting in LGUP, back and forth between Nougat, Oreo, Pie, US998, H933, etc, etc. I finally succeeded, using Method #4. Key here is that one really MUST cross-flash H93310h using Partition DL, then BACK to US99820h using Refurbish (as described in @SaiLas guide) despite the partition mismatch warning (which I had a hard doing), then Upgrade to US99830b. That worked. Once successfully on US99830b, I was able to cross-flash VS99630d. Also back and forth between US998 and VS996 no problem. Along the way, I wanted to try VS996 Oreo (VS99620k), but unable to download it from anywhere: lg-firmwares.com appears live, but downloads no longer work. And the download links in our VS996 Oreo thread are dead.

4) As expected, everything works on VS99630d: LTE, SMS, MMS, VoLTE, VoWiFi -- I am sure Hotspot would also work if I chose to buy it. But I'll use my US998 if I need that. I can move the SIM between them without problem.

5) VS99630d is very bloated, spammy, invasive, restricted, laggy -- as we would expect from a Verizon firmware. It took me some time to make it workable. First thing is to IMMEDIATELY disable Mobile Services Manager and AppFlash, which KEEP downloading a bunch of ridiculous games and other junk (same as US998, but different junk). To Verizon's credit, the following VZ apps can be disabled too: Call Filter, Cloud, hum, Message+, My Verizon, My Verizon Services, NFL Mobile, Security & Privacy, Verizon Location Agent. Disabling them will NOT affect functionality unless one has genuine Verizon service and actually wants those features. The ROM will still be slow and laggy after this, due to tracking services, which should be removed using ADB: adb pm uninstall -k --user 0 com.lge.mlt (LG MLT tracking service), adb pm uninstall -k --user 0 com.vzw.qualitydatalog (Verizon tracking service).

I was surprised not to find SRTC (LG Root Checker), which makes a big difference when removed from other V30 ROMS. I find it hard to believe that Verizon doesn't have their own Root Checker (like TMO), but I haven't spotted one. Speed is my concern, not the actual root checking. Removing com.vzw.qualitydatalog made a huge difference and finally made VS996 an acceptable ROM for me.

Other apps can of course be disabled as well to save RAM (4GB isn't a lot these days). In my case Android Wear, Duo, Google Play Movies & TV, Google Play Music, Google VR Services, LG Health, Slacker Radio, ThinkFree Viewer.

This VS99630d with InfiMobile is now an acceptable driver for me. I still prefer Red Pocket GSMT (TMO) which includes international calling and hotspot, and which works perfectly with US998 (VoLTE and VoWiFi) -- but ONLY because I have an old Red Pocket SIM from before TMO changed their MCC/MNC. Newer SIMs from TMO or any of their MVNO's do NOT work on US998.

Unfortunately InfiMobile's $99 deal (12 months of unl/unl/10GB per month) is now $120. Unless they bring it back before the end of my test month, I may go for one of their lower allotment plans, since I don't really need 10GB.

tl;dr: Verizon from InfiMobile (and presumably other MVNOs) DOES work for LTE/SMS/MMS on US998 in 2024, but NOT for phone calls since US998 doesn't support VZW VoLTE/VoWiFi. Google Voice and other data call services can be used instead. VS996 DOES work with everything but is a bloated and spammy ROM until trimmed and tweaked. As always, the SIM must be activated using the IMEI of a Verizon branded phone or an iPhone, but can then be moved to the V30.

And don't ask why I still use these old phones...