Currently, refarming isn't complete, so since he is getting EDGE, he's actually using EDGE speeds on GSM 1900 MHz, not CDMA 1900 MHz. For future 3G/"4G" access (non-LTE) for T-Mobile, a phone with at least CDMA 1900 and 2100 would be needed. If you want LTE as well, you'd also need a CDMA and...