Both carriers have similar programs that allow customers to carry unused data from one month to the next, but it's not as simple as it sounds. This is how these rollover data plans really work.
Next Big Thing
First came the news of T-Mobile's Data Stash program. Now AT&T has an offer to let customers carry unused data from one month to the next.
The company is aggressively pursuing new areas, such as Internet of Things, connected cars and smart homes.
The 4G LTE-ready Windows Phone 8.1 handset will be available on the carrier's prepaid wireless service on July 25.
When can you score a 7-inch tablet for 99 cents? When you buy an AT&T smartphone to go with it.
The limited offer will net AT&T users 15 gigabytes of data for $100. It's the carrier's latest move to defend its customer base.
The plan was aired in response to President Obama's request to the Federal Communications Commission for tougher broadband regulations. Now the FCC wants details.
CEO Randall Stephenson weighs in on President Obama's call for tighter rules on broadband providers. He also talks up AT&T's big bet on Mexico.
VoLTE is considered the next generation of voice call technology, and the alliance between the two greatly expands its reach.
The deal gets AT&T into the emerging Mexico market with a business that brings 8.5 million subscribers.