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Thats exactly what it will say "Not registered on network". But it happens after a reboot. I will notice that I didnt get an email or something, so I reboot the phone and when it comes back up I have no signal. If you try to dial out it says the above message. If you try to open a browser it just fails. Can't remember the message on the browser. But I call Verizon and they tell me to turn it off, flash something and tell me to turn it on and then it works.
I had the phone for 4 days and this has happened twice.