T-Mobile is today announcing new versions of its Simple Choice plans that include more high-speed data and unlimited international texting services. The Simple Choice plans were first introduced last year as part of the carriers Uncarrier rebranding, and are designed to make it easier for customers to choose a rate plan when buying wireless service. T-Mobile says that all 13 million of its customers already on Simple Choice plans will automatically get upgraded to the improved plans on March 23rd. The new plans double the amount of high-speed data service available before T-Mobile will throttle connection speeds — customers will now get 1GB of high-speed data along with unlimited talk and texting services for $50 per month.