These days, T-Mobile's not just trying to trip up its bigger rivals -- it's sprucing up some of its own features, too. The carrier just announced an improved way to handle early upgrades, and it could work out great if you're like us and can't stand holding onto the same phone for too long. The company's new JUMP On Demand program works almost exactly like the original JUMP plan does, save for three big changes: First, you can trade in your phone for a new one three times a year instead of two. There doesn't seem to be a limit on when you can upgrade, either (the other version of JUMP makes you wait six months before your first swap). Oh, and the $10 monthly fee T-Mobile used to charge you for the privilege? Kaput. Don't get too worked up, though: You'll just have to wait for June 28 to roll around before you can ditch your current device.