Incoming calls are being blocked

Some of my incoming calls are being blocked and when I try to answer them they go to voicemail. I can't seem to find a reason for this and I have not found a way to stop this from happening. Sorry I have a iPhone4 with the latest software and firmware.
Thank you
Regards
dennisl

Either the tower you are connected to has no channels available, the MTSO it connects to is overloaded, or you have 3G turned off or it isn't available where you are located. While 3G supports simultaneous voice and data EDGE does not, and data takes precedence. So if you are using data at the time someone calls you the call will be diverted to voicemail.

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