K, so i got a new sim for my iphone 4 with ios7 (vodaphone) and it says 'SIM Not Valid' help?

The SIM card inserted in this iPhone does not appear to be supported.
The SIM card that you currently have installed in this iPhone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iPhone. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked by your carrier. Please contact Apple for more information.
Thats what it says on itunes. need help. someone tell me why this is happening and hot to fix it!!!

Associate your mobile number with your Apple ID, if you haven't already done so.
Sign out of iMessage on the Mac:
          Messages ▹ Preferences ▹ Accounts ▹ Sign out
and on the iPhone:
          Settings ▹ Messages ▹ Send & Receive ▹ Apple ID ▹ Sign out
Then, on the phone, tap
          Use Your Apple ID for iMessage
Sign back into iMessage on both devices and test. If there's no change, you may have to wait for a change in network conditions.
Credit for this solution to ASC member SmittyLove and to Glenn Fleishman of tidbits.com.

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