Will following the guide affect the bands for T-Mobile?
As long as you don’t delete the current T-Mobile MBN file, you should be fine.
If you plan to use T-Mobile again, you can switch back to the original MBN using the same PDC.exe tool, just:
- Look for the T-Mobile or default profile in the list.
- Right-click it and set it as Sub0.
- Activate it.
- Reboot.
A few notes on the guide:
- The QPST that you linked is an ADB drivers setup, not QPST.
- Here are links to all the correct downloads:
- Also, I hold very strongly of giving credit where credit is due. Here’s the link to the original post: https://www.reddit.com/r/dumbphones/comments/1i081bc/. Please give this guy credit for putting the work in. (Thank you for simplifying and breaking down the guide, though. You made it much clearer and easier to follow.)
Also, just a note, I don’t think this unlocks locked devices. When I first saw this guide I thought that’s what it was, but I think it’s just to get VoLTE from Verizon on already unlocked devices. Cool stuff anyway
I’m not sure I understand. Will doing what it says in this guide make it not work with T-Mobile anymore? Or just adds Verizon volte as well
This post sounds like you’ll need to set it back to TMobile if you want to revert
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I just tested it. Confirmed 2 things:
- This guide is not to unlock your locked CAT to work with Verizon; it’s just to enable VoLTE data once you’re on Verizon.
- @NotABird removed device unlock in his Kitty ROM, so you can’t unlock the phone once you’ve flashed it.
What if it was unlocked before I flashed it?
Then it’ll probably be fine. Only one way to find out…
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It works if unlocked before, I might make an updated version with a few tweaks, maybe I’ll add the unlock back
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PDC.exe keeps informing me that ********connect to device failed 
It can see the device QPST sees the phone and interacts normally it seems. PDC is a wall I keep hitting.
Edit: Resolved, switching USB’s on my laptop seemed to have solved the issue 
If i remember well, i thi k i flashed the cat so it works with Verizon and because sms didn’t work i just inserted the t mobile sim card and it worked, i didn’t have to do anything,
About sms only Verizon can enable that setting? Or mvno’s can donit as well?
Was it the “CDMA-less” that wasn’t on?
(Mvnos can usually turn it on, for sure us mobile)