I have an iphone 3. No problem til husband got a 4 two months ago. Since day one, we were no longer able to recieve a call at home. Can txt, email, make call. All incoming calls go to VM. Outside home, all calls are received. We have an airwave. Apple did set up check and said all is well. Sprint store and phone techs have not been able to diagnose after multiple visits/calls. Any ideas?

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