VZW - No 3g after flashes - Galaxy Tab Q&A, Help & Troubleshooting

I recently been flashing my tablet to test some that I like. The thing is, I have no 3G anymore. Can somebody help me? The model of tablet I have is SCH-I800 from Verizon.

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[Q] A few questions for the SCH-I800

Getting my Galaxy Tab in a day or so from Amazon, and had a few questions.
The SCH-I800 from US Cellular. ($139 compared to $200 for the same thing from Verizon off Amazon)
I don't really plan on using it for data or calling, long as WiFi works, I'm fine. Unless it has GSM, which would be a bonus, but if I recall, USC is CDMA(?), or is the I800 a global unit (Having both CDMA and GSM)
I notice that the majority of ROMs available for the i800 are for Verizon, is there any chance that would mess with anything system-wise if I were to install a Verizon ROM on a USC device? I have some familiarity with flashing, just wanted to gather info before I started bricking my device.
Since I'll be using it as a tablet and not as a 3G data tab, will any of the other Tab variant of ROMs work with this tablet (At least with Sprint's p100 GT ROMs, or whatever) If not, that's alright.

[Q] Flashing a 6906 to a 6916 for wifi calling feature

Hey Guys!
I bought a Sony Z1 last year (6906) Canada boot loader locked to use on T-mobiles USA LTE network and everything worked great, only issue was I lost my Wi-Fi calling feature on the new model as it was not directly from T-Mobile and really liked the feature.
I see that T-Mobile released an almost identical version (6916), only I think has more memory and less bands available.
I tried to pull the wifi .apk file off my original android phone to see if I could make it work, and would not install assuming brand specific of permissions related.
so, wanted to pick the forums brain and see if any one out there has done this, take the firmware for a T-mobile branded 6916 model ( I believe current version is 14.2.C.0.159, until new kit kat release comes out if and when of course ) and put it on the 6906 model so the wifi calling feature can work.
Bands look to be there, and 911 # is registered so hoping this could work, unless of course someone had a reliable work around for the Wi-Fi calling ?
Please excuse my noobness, new to Z1 forum so any and all help greatly appreciated
Thanks for any help in advance!

Is 4g lte possible on boost flashed htc one?

Hello everyone. I flashed my one m7 over to boost using samsung s2 as donor. Everything is working except 4g lte. I understand that at this point I cant get 4g lte with this donor but now I'm considering finding a cheap 4g lte donor and giving it a shot. I'm sure it can be done i'm just unable to find any definitive answers or steps on how to do it. Can somebody here tell me whether it is possible and how I might go about doing it?

Help with data network on a new device

Hello guys
I just bought a new unlocked device on bestbuy.
But i`m from brazil and my carrier is using AT&T network (vivo) as I am roaming right now
the problem is that i can`t get any 3g or 4g network
Can you guys help me?
Hello i wish we could help you but this is a verizon s6 edge site. What phone do you have? Might want to check out the at&t page that fits your phone.

Is it safe to use AT&T ROM on a T-Mobile Tab S2?

Hey peeps! I was wondering about using an AT&T ROM on my T-Mobile tab S2? I recently unlocked my T-Mobile Tab S2 and am currently using it on AT&T. I noticed that I don't seem to be able to get 4G LTE on it the same way I used to when I had it on T-Mobile. When I run speed test, I only get 3G speeds. Is there a fix for this? Or am I able to run a ROM from an AT&T TAB S2 SAFELY and be able to get better speeds? This would be my first time doing this if it's possible. I am well versed on rooting and running custom ROMS, ODIN etc.
I appreciate any and all help and PATIENCE with this! Thanks guys! :laugh::good::fingers-crossed:

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