How to use LTE on my unlockd SGH-i747 - Upgrading, Modifying and Unlocking

Hi i hope someone could help me.. I got a samsung s3 from at&t from my aunt and i got it unlocked to work on other sims, but it is stuck at Edge and couldnt go lte.. Can any help me fix this.

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[Q] Help Carrier unlocking CDMA Sprint Samsung Galaxy SPH-L710? Please?

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[Q] I747 only getting edge on Cricket -- Plz help

OK so I have a Galaxy Grand Prime (locked to Cricket) that gets 3+ bars LTE at my home. I recently got an AT&T (locked to AT&T) Galaxy S3 (I747) off of eBay to use on Cricket. Since both AT&T and Cricket both use AT&T's LTE network I expected it to work without a problem. However when I put the Cricket SIM in the S3 I can only get 2G EDGE network. I have tried different APNs, network modes, even a couple custom roms. I have no idea what the problem might be.
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What bootloader and modem are on the phone? Not sure if either of those things will keep you on edge.

T-Mobile Sim in verizon galaxy s4

Hey guys so ive been scavenging through the forums but couldnt find the information.
Is there anyway i can get a t-mobile rom onto my rooted verizon galaxy s4 running 5.0.1 OC1.
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Rooting and roming help for a GT-I9192

Hiya I was wondering if anyone knew the easiest/favorite way to root and if you have a rom that you could suggest that would be cool too. Also the phone is a GT-I9192 dual sim on 4.4.2.
Edit: is this model usable with 3g or lte on att?
Edit2: so far i got h+ working on my tracfone at&t sim its pretty nice. Anyone know if this post would help me get lte or am i able to get lte with it?
http://forum.xda-developers.com/showthread.php?t=2410651

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