T-Mobile isn’t taking a breather. A day after quadrupling the amount of data customers can get on its Simple Starter plan, T-Mobile is at it again, expanding its Simple Choice family plan to 10 lines and offering to double the amount of dataat your disposal if you add a tablet. The moves represent a continued escalation of a war between T-Mobile and suddenly nimble Sprint, which is under the direction of new CEO Marcelo Claure, who took over earlier this month. Sprint, the third-largest wireless carrier by subscriber, and T-Mobile, the fourth-largest carrier, are both eager to add customers at each others’ expense, as well as from top players Verizon Wireless and AT&T.