Looking for the perfect Father's Day gift? T-Mobile is opening its digital and physical doors to gift-hunters who want to wrap a hot new smartphone for their Dads this year. All of T-Mobile's 4G HSPA+ smartphones are free with a new 2-year contract. For Windows Phone fans, that means the Nokia Lumia 710 (also in white) and the HTC Radar 4G will be your item of choice this weekend, though T-Mobile offers plenty of other devices that may catch the interest of your old man. Remember though, the promotion is only good for today (Friday, June 15) and tomorrow (Saturday, June 16), so don't run in on Sunday morning for a last-minute gift.