On 29.09.2012, I bought an iPad 3 wifi+4g LTE model, 64 GB. I did an upgrade to IO6. I inserted a Vodafone 3G microsim into it. Initially everything was going right. But at home I used it over wifi. And after that my 3G connection is not working. Though in the status bar full strength is showing. Whenever I try to browse I get the message "Could not activate cellular data network. You are not subscribed to a cellular data service." I did on and off many times and even removed the sim and inserted it again but the problem is not resolved. Please help.