i have build my project in iphone sdk 3.0.i have used frameworks that is not available in iphone sdk 2.2.1. while their uploading on app store their is one option :-choose you device type for users running in iphone os 2.2.1 and below. option 1)iPhone only option 2)iphone and ipod touch(2nd generation) option 3)iphone and ipod touch and this question is Mandatory. have a look at following link it is screenshot of that. http://img520.imageshack.us/img520/2509/image001fwb.jpg problem is my application may not run on devices which are using os version below 3.0 which option should i go for? this is urgent kindly help me.