So now I may not have to change to AT&T (NYSE: T) after all: T-Mobile USA, which is the carrier I have been using for a long time (and Staci and Tricia here do too), has also announced a flat-rate unlimited package, costing the same as the ones announced by Verizon Wireless (NYSE: VZ) and AT&T earlier today. The plan from T-Mob is $99.99 and begins Feb. 21, and cover all types of mobile messages, including pictures, in addition to voice calls.

SEE ALSO: AT&T Joins The Flat Rate Bandwagon, Hours After Verizon Wireless; Only Voice

Meanwhile, Sprint (NYSE: S) said today that it was testing plans in four markets with unlimited voice, text and Web access for $119.99 and $149.99. Meanwhile, MVNOs Boost (owned by Sprint) and Helio. co-incidentally tweaked their unlimited plans earlier this month. Also, second tier carriers Leap Wireless and MetroPCS offer unlimited calling for customers, but with no roaming.