I just upgraded my iPhone4s to iOS7 and now I am unable to make phone calls and send/receive text messages. Network signal indicator on the upper left side of the display shows hollow circles instead of full circles. Any idea how to fix the problem?

I just upgraded my iPhone4s to iOS7 and now I am unable to make phone calls and send/receive text messaes. Network signal indicator on the upper left side of the display shows hollow circles instead of full circles (but with the network provider name). I checked with my colleagues in the office who use the same network and theirs work just fine on iOS7. Any idea how to fix the problem?

I have also called my service provider and my service remains active in the network. I tried removing and reinserting my SIM but to no avail.

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