T-Mobile today announced it will offer an unlimited family plan that starts at $100 for two lines with unlimited talk, text and data.

Beginning Dec. 10, customers can get the deal and add up to 10 lines with unlimited talk, text and data for $40 each.

The new deal represents a $40 discount off of T-Mobile’s existing unlimited family plan option which charges $80 for the first line, $60 for the second and $40 for each additional line. But where that plan option tops out at six lines, T-Mobile’s new offer goes up to 10 lines.

The plan also includes data tethering, unlimited international texts, unlimited text and data in 120 countries, and unlimited in-flight texting on Gogo.

T-Mobile CEO John Legere painted the deal as a remedy to overage charges and accused his competitors of getting fat off charging subscribers who exceed data limits.

“In 2014, AT&T, Verizon and Sprint pulled in more than $1.5 billion – yes, with a ‘b’ – in overage penalties. And, it’s no surprise that AT&T is the worst offender by far – collecting more than half of overage penalties this year. T-Mobile’s unlimited 4G LTE family plan is a simpler, saner alternative to the carrier’s crazy gigabyte games,” Legere said in a statement.

T-Mobile also extended its $100 offer for four lines and 10GB of data. That deal hands out 2.5GB per line (not a sharable bucket of 10GB) and reverts back to 1GB per line on Jan. 2, 2016.