Originally Posted by djkinetic
The TMO GS5 has all the needed ATT LTE Bands no need for a radio flash, I'm using one on ATT now, have gotten LTE from day 1, as stated only requirement is the sim has to be originally activated on a LTE ATT device and that the APN is set properly.
That's not true, you can activate WITH the T-mobile S5 IMEI, if you are on a legacy unlimited plan, they with switch it up to the 4g/LTE unlimited plan. if your on a tiered plan, T-mobile's IMEI IS in their database, see chat below as i confirmed what shows up on my account and have LTE:
Thank you for your patience! Your AT&T Representative will be with you shortly.
Welcome! You are now chatting with 'Angela'
Angela: Hi Kyle, I am more than happy to check your plan for you online.
KYLE: and what device shows up on my account
KYLE: and the IMEI
Angela: Here's it say Samsung.
Angela: Is it the wrong one? May I know what phone do you use currently? Is it a smart phone
KYLE: samsung s5
KYLE: what does it show
Angela: I understand.
Angela: Can you give me the IMEI so I can check on our system.
Angela: You can dial *#06# on your phone to get it.
KYLE: xxxxxxxxxxxx305 (digits removed)
Angela: Thanks! Let me check.
Angela: Yes, the IMEI is the same.
KYLE: ok, does it say anything besides Samsung?
KYLE: and what data plan am i on
KYLE: ok, great
KYLE: which data plan am i on
Angela: I'm currently checking
Angela: Your plan is unlimited.
Angela: for $30 a month.
KYLE: or regular
KYLE: excellent, thanks
Angela: What else can I assist you with today?
KYLE: nothing, that's it
Angela: I am glad I was able to resolve your issue the first time you chat in today. Thank you for choosing AT&T. My name is Angela. Have a wonderful night.
keep in mind, SM-G900T is the T-mobile version of the S5, and SM-G900A is the ATT version,. You do, however have to manually add in the LTE APN settings. once that is done, you're golden.