T-Mobile's latest family data plans are a downright bargain

T-Mobile has a new promotion for both new and existing family subscribers, and it’s significantly cheaper than anything from the other major carriers.

The new plans provide 10GB of 4G LTE data per line, starting at $100 per month for two lines. Subscribers can add a third line—also with 10GB of its own data—for $20 more per month. For those who sign up by Labor Day, T-Mobile is giving away a fourth line at no extra charge (though taxes and fees still apply).

By comparison, Verizon charges $170 per month for two lines with 20GB of shared data, and AT&T charges $180 per month. For a plan with four lines and 40GB of shared data, Verizon and AT&T both charge $360 per month—three times the price of T-Mobile’s current promotion.