Why is my iphone 4s not receiving calls?

I have a unique problem with my Verizon iPhone 4S. I am unable to reliably receive incoming phone calls and text messages. I can place outgoing calls, I can use data with normal speeds over 3G. When someone calls me, the phone will go straight to voice mail or will ring a couple times on the caller's end and go straight to voice mail. On my end, the phone will not ring and does not notify me in any way that there is an incoming call. If the caller leaves a voice mail, I will get that notification.

I've worked through Verizon's tech support, reset the network settings on my phone, done *228 options 1 and 2, done *73 to make sure that call forwarding is disabled, and Verizon has even gone so far as to send a technician to my area to check the signal quality.

Verizon states that i'm in a "marginal" signal area, but I always get 4-5 bars of signal strength on my phone. The Verizon tech told me that iPhones perform poorly in poor signal areas.

I should also add, my wife's iPhone 4 works perfectly here. So does my Android phone and my work Blackberry.

Any thoughts or suggestions?

Thank you.