Originally Posted by
HDQDD
Not sure what criteria you have or how you came to that conclusion, but I personally prefer AT&T. Same GSM (TDMA) /LTE tech as TM, but a much better U.S. network (both data and phone). Since I'm in the US more than I'm not, that's more important to me. In theory, ATT phones would work on any of the Int'l networks that TM works on. At least in the 35 or so countries I've been to, I've had no issues with ATT and typically I have had 3-4 networks to choose from.
If price were not a factor, I'd agree with you 100%.
But given the thousands of dollars (well, under 2, but more than 1) that I save every year with T-Mo, it's the winner.
Comparing apples to apples, you give up a bit (less and less) good US coverage for a price reduction of about 50% going AT&T to T-Mo.
Then, add the free international roaming, and for travelers who would otherwise pay for AT&T's (faster) roaming, you save another bundle.