Hey there Cherylh2!
No network is not good at all! When did this start? Have you tried going under "Manage Connections" in your menu? It looks like a little tower and it should have the ability to turn on your mobile network. Also, could you try pulling the battery out for a short while? Then power it back up. It may need to re-register with the network to get signal again. Please also try to delete and re-send Service Books (http://bit.ly/RdgWNx). Please let us know if this works and you are able to get connected again!
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