The Simple Choice North America Plan, otherwise known as "Mobile without Borders," is the latest installment of T-Mobile's Un-carrier Amped program.

Applied both for landline and mobile, the new plan gives users unlimited call, text, and data in Mexico and Canada as if they are still in the U.S. at no additional cost. The Verge noted that T-Mobile has partnered with "the number one and number two carriers" in the two countries for its roaming service, but no specific names were dropped.

According to its official website, Simple Choice also lets phones work with users' 4G LTE plan like normal. The 4G LTE plan provides unlimited data and texting when you travel to over 120 countries and destinations, unlimited music streaming from top services such as Pandora and iHeart Radio, and Data Stash, which rolls your unused data to the next month. Currently, Data Stash can only be used domestically, but it will be available for use in Canada and Mexico later this year.

All the aforementioned Simple Choice features are already included for new subscribers. For old subscribers, however, a plan upgrade or a $10 addition is a must to take advantage of the three-country service.

T-Mobile claims that its Mobile without Borders project is a way for the company to be transparent and economical. Taking a dig at its rivals, CEO John Legere mentions in his vlog that hidden fees and punishing charges that the top carriers often burden users with will no longer be a problem for users who avail of its new plan.

The Un-carrier campaign-Simple Choice's mother project aimed at increasing the company's reach and expanding its customer base has been proving a success as Huffington Post noted a 2.1 million increase in user count in the second quarter of this year alone.

CEO John Legere has been widely credited for raising T-Mobile from last place to third place in the mobile carrier rankings, thanks to his bold moves such as dropping the common two-year contract and data roaming fees as well as allowing customers to upgrade their phones for free.