This Sunday is Fathers Day, and what better way to say "thanks Dad" than a free phone? Starting at 8am Saturday, T-Mobile will be offering all of its current phone models for free. The catch? You just have to sign up for a new family plan or add a line to an existing family plan - thats it. This means you can grab a brand new Bold 9700 or Curve 8520 (among other devices) as part of the deal. It looks like this may only go for in-store sales, so I wouldn't waste time scoping things out online. Hit the jump for the full press release. Thanks to everyone that sent this in!

BELLEVUE, Wash. - (BUSINESS WIRE) - To help celebrate dad, T-Mobile USA, Inc. today announces the mother of all Father's Day offers: on Sat., June 19, for one day only, every phone in every T-Mobile store is free.* This first-of-its-kind promotion will "untie" families from giving dad the traditional, same-old gift, instead offering him something he craves - a new smartphone.

T-Mobile will break the traditional gift-giving mold by offering every phone in every store for free. This Saturday, starting at 8 a.m., simply visit a T-Mobile retail store and switch to any family plan, or add a new line to an existing family plan, and walk out of the store with a new phone for every new line with a two-year agreement - customer's choice - while supplies last.

"For this very special day celebrating dad and the entire family, T-Mobile is thrilled to offer an industry-first promotion that helps families stay connected," said Adrian Hurditch, vice president of marketing, T-Mobile USA. "This unprecedented event champions dad and helps families stick together with the latest phones - all for free."

With affordable unlimited calling, texting and data family plans, T-Mobile is giving our most connected customers options that take advantage of the latest devices. With the Father's Day promotion, dads can choose from a selection of 30 devices, no phones excluded, including a variety of brands such as HTC, Motorola, Nokia, RIM, Samsung, SonyEricsson, and Sharp. All phones will be available while supplies last, so customers are encouraged to arrive early to stores to secure the latest and most popular new devices, including the most recently launched smartphones from T-Mobile:

* myTouch 3G Slide : Combines a slide-out QWERTY keyboard with an incredibly crisp, high-performance touch screen powered by the latest Android software. The device hosts unique new features that will help dads connect more easily, more quickly and more often, including the Faves Gallery , myModes and Genius Button .
* HTC HD2: Offering the largest touch screen size on a smartphone in the U.S., this slim and sleek device comes ready with a blazing-fast processor and access to millions of eBooks, movies, television programs and more, keeping dad constantly entertained.
* Garminfone : For the adventurous dad, this new Android -powered smartphone is fully-integrated with Garmin's premium navigation experience and includes voice-guided and on-screen directions, real-time traffic, weather, and gas price updates.

"No More Ties" - Dads Want Smartphones

T-Mobile's celebration of dads couldn't come at a better time with new T-Mobile survey results showing that more than half of dads received Father's Day gifts they didn't want. In fact, 53% of dads don't recall the gift they received just two years ago.

According to the poll, one in four dads would ban ties as gifts for Father's Day, and the majority of dads (56%) would trade all ties in their closet for a new phone. Nearly three quarters (74%) of dads polled said they would be excited to get a new phone for Dad's Day, and more than half believe their current phone is out of date.

Dads want a gift they'll actually use, with two-thirds admitting they've received a Father's Day gift they've never or hardly ever used. If dads had their way, not only would they ban ties but 19% said they would ban golf balls, 17% would ban coffee mugs, 14% would ban cologne and 11% would ban desk sets.

*The offer is valid at T-Mobile owned and operated locations only. New activation on qualifying family plan with two-year agreement required. Limit five lines per family plan. Mail-in rebate and restrictions may apply. Store hours may vary. See store for details.