Its wrks perfectly on ipad 1. I have my own whistke number for my ipad. Wrks , no matter 3g connection or wifi. All it needs is an internet connection. Itll wrk on ipad2 also. No reason why itbshouldnt. I wouldnt use it to completely replace cell phone though. If ubhave minutes plan thn whistle is good to help save ur ninutes. Id use whistle as te backup emergeny line. Plus uncan have ur whistle number forawrded to ur cell phone. Lets say someone calls ur whistle phone nnu dontnpickup, itllautomatically forward tour cell phone n ur cell phone will rig.