I have 2 iphones, iphone 3g 8gb (jailbroken) and Iphone 3gs 16gb. For my 3gs I have "pocketdyno", "speedometer" (which is VERY accurate), "bolt & nut", and "VIN History", and "GM Mobile". I love gadgets and on my jailbroken 3g I have 17 1/2 pages of apps, but it kinds of slow the phone down a little. On my 3gs I have just 9 pages. By the way those apps are free. There are some better ones but you have to buy them and there is no point for me to buy because they will not be used that much. If you have ANY questions concerning the iphone I can basically answer all.