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Not always
I was just reading that AT&T uses bands 2.5.and 17 for the most part
T-Mobile uses bands 2 and 4 for its LTE
http://www.phonescoop.com/phones/phone.php?p=4406
Samsung Galaxy S5 | Galaxy S5 Smartphone Reviews & Specs | T-Mobile
I would check those sites - they have some useful information about the bands supported by the different carriers
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Samsung makes a lot of carrier-specific sub-models The ATT S5 is called SM-G900A.
It's quad-band GSM (as are most phones these days) so it will work on T-Mobile. But let's look at the 3G & 4G specs:
3G: HSDPA 850 / 1900 / 2100 - It has 1900 (band-2) which T-Mobile uses but lacks band-4 (1700, AWS) which T-Mobile also uses.
LTE: 700 / 850 / 1700 / 1800 / 1900 / 2100 / 2600: The important things here are the 1700 & 1900, which are the two bands T-Mobile currently uses for LTE. The 700 is band-17 and not compatible with the 700a (band-12) that T-Mobile is deploying.
All in all, a good phone that should provide very satisfactory service in about 95% of areas T-Mobile serves. You may find your self in some peculiar areas like Port St. Joe, FL where T-Mobile has only band-4 3G service and not be able to use your phone but these types of areas are not very common.
OBTW, you will need to get the phone SIM-unlocked.
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Oh, thank you! I guess I'lol be unlocking now.
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I'll*
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Great discussion everyone If you still have questions about this suevmb you'll want to review this document: Bring your own device setup guide
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If this would help my S5, formerly an AT&T phone, works fine in my area (ChampaignUrbana, IL). After having an AT&T account for 13+ years I was ready to change to T-Mo. This has really been a learning experience.