Once in a while new and existing iPhone users question themselves “AT&T or TMobile better or Sprint / Verizon” – and while it is impossible to give the answer at once, there are some things that might sound too real.
So what iPhone carrier is the best? I am sure that a lot of AT&T customers believe that their mobile operator has the best coverage and options. At the same time a big number of users are leaving AT&T these days because of expensive fees and data throttling. The carrier has a lot of iPhone users grandfathered in unlimited data plans and they suffer from low speeds.

T-Mobile iPhone users also think that their carrier is the best one. You probably know John Legere from this company. He can surprise users and likes to speak about rivals assuring they are finding ways ‘to screw users out of extra money” and something similar to this. He is always challenging other U.S. carriers and this way they should also become better and offer great deals to their subscribers.
If you are traveling a lot you might want to either unlock AT&T iPhone 6 / 6 Plus or switch to T-Mobile. Why? AT&T vs T Mobile comparison proves that the second company is better for international calls because you can call for free from Canada. You also get unlimited data, texting and calling and can leave your mobile operator at any time. If you are locked to AT&T you cannot just leave without becoming unlocked in the first place.
AT&T has its benefits as well. Still T-Mobile seems to look more into the future and offers unexpected packages and deals AT&T might never offer.