Why does my iphone randomly say activation required?

So the other day I was just using my iPhone 4 running IOS 6 beta and I had shut down my iPhone completely for about 2 hours and then when i turned it back on, it said "activation required and it wants me to connect to Wi-Fi to connect to apples activation servers. It will not let me get to my home screen and everytime I try to activate it it tells me to try again later. BTW, it also says no service at the top of my iPhone. And this has also happened to my iPad.

Apple disables alot of idevived running 6.0
try to restore to 5.1.1 in itunes.

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