T-Mobile hasn’t always been the well-loved underdog on the rise we know them as today. In fact, they used to struggle quite a bit when it came to gaining more users. Over a year ago, when the company announced their first Un-carrier event, they began to change industry standards for the better. Since the Un-carrier events have been around, T-Mobile has gained millions of subscribers, and are currently on their way to being the third biggest wireless carrier in the United States.

The wireless carrier isn’t done with surprises quite yet, as they have just announced their Un-carrier 8.0 event with the tagline “So big we had to keep it under wraps.” The event will take place on December 16th, at 10:30am ET/7:30am PT. CEO John Legere will sit down with Yahoo Tech’s David Pogue for a live Q&A to announce T-Mo’s next big move. If you’d like to watch the live stream, head to the T-Mobile Newsroom for a link tomorrow morning.

So far, we have no clue what the Un-carrier is planning to announce at the 8.0 event. Past events have included paying off early termination fees, free tablet data and free music streaming through select services. What do you think the carrier will announce tomorrow? If you have any predictions, be sure to share them down in the comments!