Hi, my iPad suddenly could no longer pick the network 3G signals. The last thing I remember I did was install and try to use Qwiki, a software I got from the AppStore. It did not really work because at that time the network was slow and I exited the program. About an hour later, I noticed I had no signals. I have been to the network office and they managed to prove that the problem was not from their end. Please what do I do? Thank you.