From Wi-Fi Networking News -- T-Mobile is offering its voice subscribers free wireless Internet access at all T-Mobile HotSpot locations on weekends, from Midnight Saturday morning until 3am on Monday morning.

Glenn Fleishman writes, "They're using a system that reminds me of the failed Excilan process: you enter your cell phone number, and, if you're a T-Mobile subscriber, you get an SMS with a passcode. You only need one passcode for the entire weekend if you've got cookies enabled and use the same machine; otherwise, you need to request a new passcode for each session."

No word on how long this "limited time promotion" will last, but it seems like a no-brainer for T-Mobile -- increase customer retention, promote the hotspots, and maybe even attract some new subscribers, all at the same time.