iPhone call density not even

I have a friend with an iPhone who says it never fails that when he's on the phone 3 or 4 messages queue up for him and are waiting when he ends his call.  In other words, the call density is much higher after he finishes a call than when the phone is just sitting on desk.  

I've been with him several times when he gets calls and this does indeed seem to be the case. As soon as he hangs up there are 3 or 4 calls waiting for him, while there were no calls for the previous 30 minutes or so.

I was  just wondering if there's something to this. It acts as though activating the phone, by taking a call, somehow lets waiting calls come through.

Does anyone know what might be going on here?

Thanks for any ideas.
stevaAsked:
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emkawarriorCommented:
Check the signal strength where he is. Basically he might be on the edge of good reception, lifting the phone up to his ear is increasing the signal just enough for the calls to go through. Height is the biggest part of reception. What he might need to try is place the phone on a high bookshelf or similar and see if that helps.

Is he getting "Missed call" notifications and/or voicemails?
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stevaAuthor Commented:
Thanks.  He's in New Orleans now for awhile so I can't ask the question you asked, but I will when he comes back.  I'll give you the points now, though.  Thanks again.
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