I have an unmodified iPhone 4S running on the H2O network. After I updated to 5.0.1 I noticed that there is a strange lag during my phone calls. It takes about four seconds after pressing Call for the call to start and two-three seconds for the call to end after pressing End. Also when I have to dial a number while talking to an automated service the number doesn't register for one-two seconds after pressing it. I've tried restoring the phone but it still does it. The problem isn't that terrible but it is very annoying knowing I didn't have this while I was running 5.0. Anyone else experiencing this?