it's been a while since Ive used tethering (a wee or two) and was using the comcenter hack... I havent upgraded past 4.1. on my iPhone 4. Today I went to use it, and while the phone and laptop connect and I ge tthe blue tethering bar at the top, I am not able to get online. I also have MyWi and am experiencing the same problem. Any suggestions? Thanks.