Yes, and a jailbreak is not always available. A recent release was the first Jailbreak in a while. Of course, you can always not update until the next is ready, which many choose to do.
Dave, AT&T disables wifi sharing if you have an unlimited plan. The jailbreak is required to get around the restriction. AT&T also blocks FaceTime over cellular on unlimited plans. This is specifically on the iphone- I'm not certain if they do/can block hotspots on android.
z6joker9 wrote: