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Help Galaxy S5 only running 3G


I am inclined to say that the regional variant, SM-G900i, will not work on the T-Mobile (USA), network's 4G/LTE bands as the modem/baseband is optimised, hardware wise, for the international areas mentioned previously. You could try contacting T-Mobile (USA) directly, to see if it can use their 4G/LTE bands or if you need to register the phone with them. Sorry, I cannot give a more definitive answer on this question.
 
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