switching from i337 to M919 carrier and rom questions - T-Mobile Samsung Galaxy S 4

Hi. I just purchased a att i337 from ebay last week and it came with android 4.4 so it has a locked bootloader so I can't install CM 11 or CWM. I'm thinking about returning it or selling it and buying the M919.
does the M919 have a locked bootloader on any android version? I believe the i337 was unlocked till 4.3
Can I install CM 11? are there any issues I should know about?
does the tmobile version work on att 3g and 4g? FYI: I'll be using airvoice, which is a att mvno.
are there any other versions I should look at on ebay besides the M919? they would have to work on att 3g and 4g. I'm in the USA.
thanks.

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At&t Galaxy Note 3 Unlocked to T-mobile...Which ROM do I use?

I have a at&t galaxy note 3 unlocked to t-mobile. Do I flash t-mobile roms or at&t roms?
re: Tmobile/ATT roms
sai5o4 said:
I have a at&t galaxy note 3 unlocked to t-mobile. Do I flash t-mobile roms or at&t roms?
Click to expand...
Click to collapse
If you are on Tmobile and your phone is an AT&T you should flash the N900T
Tmobile version of this rom, you should also flash a tmobile N900T kernel.
It can be found here: http://forum.xda-developers.com/showthread.php?t=2671039
I heard that AT&T Note 3's even rooted and using safe-strap cannot flash any
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Good luck!

[Q] using unlock code on rooted phone?

I'm going overseas to Europe very soon and I recently just received an unlock code from att for my galaxy s3 (stock 4.3). However, will att carrier unlock codes work on a rooted device?
marksman789 said:
I'm going overseas to Europe very soon and I recently just received an unlock code from att for my galaxy s3 (stock 4.3). However, will att carrier unlock codes work on a rooted device?
Click to expand...
Click to collapse
It should be fine. Just gotta make sure you're on stock as you need the stock dialer.
yup, i tested it with a friends tmobile sim card and it worked fine

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My galaxy s3 is from ATT&T but it is unlocked for T-mobile and T-Mobile is the service provider that I am using. I wanted to put Cyanogenmod on my S3 and I am not sure on whether i should flash the CM file with the att variant or tmobile variant ?
navpal said:
My galaxy s3 is from ATT&T but it is unlocked for T-mobile and T-Mobile is the service provider that I am using. I wanted to put Cyanogenmod on my S3 and I am not sure on whether i should flash the CM file with the att variant or tmobile variant ?
Click to expand...
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You want the D2lte version.
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