[LG V30 Questions & Answers] teknomedic:
If you have an old Verizion (USA) unlimited data plan (or perhaps other "older" phone plans) that you've been holding onto AND you plan on buying unlocked phones you may want to read about what I learned today... This is mostly a PSA, but if anyone knows of a way to actually "fix" the issue please reply.

The short version is that apparently the old (original) unlimited data plans are setup to only work with locked down "Verizon" phones. I'm still working out all the ramifications of this and could use some help further down in this thread. What this means is that you can NOT activate a NEW sim card in an "non-Verizon" (unlocked) phone IF you're also on an original unlimited data plan (and perhaps any other older plans beyond a certain date?). You CAN; however, activate a NEW sim card in an OLD Verizon phone and after setup is complete you can then move that sim over to your new phone. This should not be a problem for NEW Verizon phone plans OR locked down phones that are considered "Verizon phones" by Verizon software.

As far as I can tell (so far), activating a new sim in an old phone and then moving to the new phone doesn't cause any issues with your service, but I could use some help testing this out in greater detail to confirm.

Here's my story:

I've been on a Verizon unlimited 4G data plan since they first offered them many years ago. I've remained on this plan through price increases and the removal of unlimited only to watch them return it (I almost switched to a new plan months ago... almost). I used to have a Droid Razr Maxx which got rooted and I enjoyed root for awhile. I eventually upgraded to the Droid Turbo (employee edition) which took a long time to gain root so I simply never tried. I decided I wanted root access again and all the joys that brings so after much research into my next phone I landed on the LG V30 unlocked edition. I got my order from B&H Photo a few days ago. I also decided that I wanted a new sim card as I've always felt my old one was "touchy". Could never put my finger on, but mostly I just wanted to start fresh with the V30.

A couple days ago I went into an official (USA) Verizon store and made my request to get a new sim activated on my V30. I didn't think this would be an issue as they sell V30s and I know others have been running "non-Verizon" phones without issues. The CS rep was supportive of this, but after inserting the new card and trying to activate it the Verizon software on his employee tablet shot back something about "this phone does not support this data plan" (or something similar). He tried to troubleshoot the issue for about 10 minutes, but then gave up since I was able to get the V30 working by using my old sim from my Droid Turbo. I accepted this and decided I'd just try again in a few days.

During this time I had no issues with the V30 using my data or making phone calls. I did eventually "kill" the V30 by exploring the band selection screen in the service menu, but a hard factory restore later and I was up and running again. Today I decided to try and get a new sim card again, only this time I decided to head to Best Buy since they sell the unlocked V30 online. My thought was "if they sell the unlocked V30, maybe they'll better understand my issue with a new sim activation"....

After finding the "sim card expert" I requested we went to work. He pulled our a new SIM, dialed up his Verizon contact number and we waited. Once the Verizon rep was on the phone we continued onto activating the sim only to be met with the same error "phone & plan don't like each other". The Verizon rep was stumped after many trial and error attempts on getting it to go through. My issue was eventually escalated to a tech that had more power to get things working and even he was stumped. After nearly 2 hours of digging into provisions and my account info he informed me that my "old" data plan was setup in such a way that it ONLY allows new activations with "Verizon" phones. Of course he suggested I move to a new unlimited data plan (with all the new fine print and prioritizations after 22GB intact of course, ha). He added that there was nothing he could do to change my plan settings to allow new "non-Verizon" phones. He was supportive of activating the new sim on my old Droid Turbo and then placing it into the V30 though. Once we did that the V30 was up and running again. On some quick tests everything appears to be working as well (would like some help to verify this though).

So there's the info I learned today, hopefully this helps someone else avoid any headaches later. How accurate this info is depends on the Verizon tech on the other end of the phone though as I'm only repeating what I was told. The tech did say that he never ran into this before (as I assume most people simply keep swapping in their old sim cards) and he did add that newer plans and phones shouldn't run into this issue and that it's strictly my old plan causing the hiccups on their system. He did check into moving me to the new data plan for activation and then putting my back into my old plan, but came back with "it's not possible".