T-Mobile is so confident in its HSPA+ network that it is willing to bet anyone in the Seattle area $1,000 that its Samsung Galaxy S 4G is faster than an iPhone (Verizon and AT&T, both). Bring your iPhone (any generation will do) into a participating Seattle-area T-Mobile store this weekend and play a good ol’ fashioned game of “best out of three,” in which you can pit your iPhone against the Galaxy S 4G. Using a “third party” speedtest app, T-Mobile will test its network against yours, and it is confident that it will reign supreme. If you happen to pull off an upset and beat T-Mobile at its game, the carrier will give you a cool $1K. If not, T-Mobile will give you $300 to trade in that slow iPhone for that blazing new Galaxy S 4G.

Participating locations are listed in the shot above. Check out the official press release detailing T-Mobile’s Speed Challenge at the source link, and if you’re in or around Seattle this weekend and still holding on to your iPhone, stop in and try your odds.

Source: T-Mobile