Sprint's CFO says it's a problem that Sprint and T-Mobile US are so much smaller than the top two carriers.
Aio is now available online nationwide, following a limited regional rollout.
The subsidiary was designed to directly compete with T-Mobile's Simple Choice plans with competitive rates.
You can't own a color, but T-Mobile is hoping it can own magenta in regards to branding a no-contract carrier.
T-Mobile US had 1.1 million net customer additions in the second quarter, as customers backed its new no-contract plans.
Verizon is the latest carrier to jump on the no-contract craze. Let's see how its offering stacks up against already-announced plans.
At a press event Wednesday, T-Mobile announced a new program that lets people upgrade their phones twice a year as well as further expansion of its LTE network.
T-Mobile said Friday that it has signed an agreement to buy 10MHz of Advanced Wireless Services (AWS) wireless spectrum from U.S. Cellular for US$308 million in cash.