I have the (2.5 years) original Att Kaiser Tilt Ttyn II. It is is still working, but (think its time) ready to upgrade. I travel internatonally, a PC geek, and love the HTC smartpone connectivity with wifi, bluetooth, 3G and such. Plus you can get just about any app. you want online for free for your windows based smart phone. My kids all have Iphone 3G'S Iphones and love them. Is the Iphone 4 connectivity limited if you have Windows 7 based desktop for sync of contacts, tasks, calandar, and such, like Windows Mobile Phone? Please post if you were once a Kaiser Att Tilt user and upgraded to the Att Tilt 2 or the Iphone 4.