3G signal disappears every time while making phone calls

Hi all,
After my iPhone was updated to 4.2.1, the 3G signal disappears every time while I make phone calls, but if it is hooked up with WiFi then it would be fine. Does the same problem happen to anyone of you? Any suggestions?
Thanks a lot

I have had similar problems. I-Phone worked beautifully for about 3 weeks the I started getting static on my end. I did some research and narrowed down the fact that the static was only heard on my end. It started just sporadically but is now about 85% of the time when Imake calls. It happens in multiple locations and cities. The caller on the other end never hears it. There is no problem with speaker phone or playing music etc...It happens when calling hard lines as well as wireless (ie...verified calls to Sprint, Verizon, Nextel wireless callers as well as Government Land Lines, Verizon home phone and Comcast Ip Phone callers) Stopped in to AT&T and they looked at me funny and suggested I ask Apple to replace the phone.

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