About six months ago, T-Mobile rolled out the HotSpot @ Home service, which lets you use certain handsets to make calls via WiFi as well as its regular GSM network. For a minimal monthly fee, all the calls that you make over a wireless network are "free" and not deducted from your monthly minutes. Not too many phones are compatible with this service, though--so far, the only ones that can take advantage of the HotSpot @ Home service are the Samsung SGH-T409, the Nokia 6086, and the RIM BlackBerry Curve 8320. Not anymore, though, as today T-Mobile has announced the Samsung Katalyst, a stylish slider phone with a 1.3-megapixel camera, a music player, a microSD card slot, stereo Bluetooth, and of course, compatibility with HotSpot @ Home. Pricing will be released shortly, and we'll update you with more information as soon as we get it.