Hi, my iPhone 4 is stuck in welcome screen, even though I've had it backed-up and connected to my PC and iTunes the enire time. It gives me the message "Your iPhone could not be activated because the activation server is temporarily unavailable. Try connecting your iPhone to iTunes to activate it, or try again in a couple of minutes." I have tried many times. I am using the Verizon iPhone 4, and activation is not working through iTunes using the information there. I was unaware I would have to reactivate my phone when upgrading. I was under the assumption everything would be restored. Any help would be great. Thanks.