T-Mobile Samsung Katalyst just went live on T-Mo?s network Here is the scoop on this "Hot Spot at Home" Phone:

Wi-Fi-enabled, and does support HotSpot@Home
myFaves
MicroSD expandable memory
Quad-band
1.3 megapixel camera
"With built-in support for T-Mobile HotSpot @Home, the Samsung Katalyst provides customers with great wireless coverage when placing calls over a home Wi-Fi network and at nearly 8,500 T-Mobile? HotSpot locations nationwide. When customers leave home or a T-Mobile HotSpot, their calls are passed onto T-Mobile?s wireless network, and the same is true for passing calls from T-Mobile's network onto Wi-Fi networks. In addition, with the purchase of a HotSpot @Home add-on plan, customers can enjoy the freedom of unlimited, nationwide calling over Wi-Fi.** Available exclusively from T-Mobile, the Katalyst features a sleek, slider design with a sophisticated metallic silver finish and is equipped with Wi-Fi connectivity, Bluetooth wireless technology and a 1.3 megapixel camera. The Katalyst also features advanced messaging capabilities including instant messaging, which enables instant chat and supports AOL?, ICQ, Yahoo! and Windows Live Messenger."

All this for only $79.99 at t-mobile