T-Mobile CEO John Legere is not a fan of AT&T. Under the new Simple Choice promotion, a family of four paying $100 a month can share up to 10GB of LTE data, with each person getting 2.5GB. Even better — there are no overage fees.

He wrote: Leaving my office last week, I pulled alongside a bus covered with yet another ad for AT&T's 'Best-Ever Pricing' for families. These ads are everywhere. AT&T's sinking some serious dough into marketing their latest-greatest family pricing, which strikes me as funny. Because their deal is no deal at all, and next to T-Mobile's Simple Choice Family Plan, AT&T's 'Best-Ever Pricing for Families' is a joke."

"It infuriates me that they're selling this to hardworking families who could use that money for more important things," Legere wrote. "And they have the nerve to call it 'Best-Ever Pricing.' I just couldn't stand by without speaking up and calling them on their BS."

Below is a comparison of the four largest carriers.