Welcome to this morning's edition of "First To Know," a series in which we keep you in the know on what's happening in the digital world.
Today, we're looking at three particularly interesting stories. T-Mobile has joined the rest of America’s big wireless carriers in offering the iPhone 5. Microsoft has started talking publicly about its next operating system. And, as the Supreme Court hears potentially landmark arguments on the Constitution and gay marriage, lawmakers are expressing their support on social media.
Check out the video above for more on these stories.