My ipad keeps going back to "no SIM"? .

My iPad keeps going back to "no SIM" instead of AT&T 3G at top -- thus, I am unable to access WIGI / Cloud connections.  What does that mean?  Has never happened until I download the new iO7!

1. Close all inactive apps. Double-click the Home button and hold apps in the Task Bar down until they all wiggle then tap the minus sign to close apps. Tap the home button to return to Home screen.
2. Hold the Sleep/Wake and Home button down until you see the Apple Logo.

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