More than five years after Apple's groundbreaking iPhone debuted exclusively on AT&T in the United States (before later expanding to Verizon and Sprint) it's now official. Subscribers of T-Mobile will have access to Apple's iPhone 5 beginning April 12th.

As widely anticipated in recent days, Apple's new partnership with T-Mobile will likely provide a tremendous boost to the nation's fourth largest carrier.

On Tuesday at T-Mobile's "uncarrier" event, the company confirmed that it wants to set itself apart from leading rivals AT&T,