Valentine's Day is happening next week and T-Mobile is launching some deals to celebrate.

Starting February 10, T-Mobile will offer a free line of service when you add a line. There is some fine print to be aware of with this deal, including that you must have at least three full price lines and that the credit for the free line will be applied to the lowest cost line added while the offer is available.

Also of note is that with this deal, if you cancel any of the paid lines, the credits will stop. There's a limit of one free line per account, too.

T-Mobile says that this free line deal is stackable with its other offers. That means that you can pair it with the Buy One, Get One deal that T-Mo is currently offering on flagship phones from Apple, Samsung, and LG, as well as the new Apple Watch deal that's launching tomorrow.

Beginning February 10, you can get half off an Apple Watch Series 3 when you buy one at regular price.

Finally, T-Mobile is offering some deals on Beats headphones for Valentine's Day which are available right now. You can get $60 off the Beats Solo3 ($239.99), $40 off the Powerbeats3 ($159.99), or $30 off the BeatsX ($119.99).