My phone does not ring when receiving a call. It then goes to voicemail and doesn't show a missed call.

I have an iPhone 4. When someone tries to call me, the phone sometimes(most of the time now) does not ring. It will roll over to voicemail but does not show a missed call. Has anyone had this same thing happen and how did you get it rectified?

My wife's iphone 4 also has your same no ring problem as does my iphone 5 just less often.  I called her iphone 4 at home from where I work 20 miles away on my iphone 5.  With her phone in 3G mode ONE call went through and 9 went to voice mail in 10 tries.  This is a 10% sucess rate!!  I also could listen in real time from the wired work phone and the wired home phone.  She turned off 3G mode and it went to "O" mode at  the top left of the screen after the ATT.  In this mode it rang on the first ring tone 5 times out of 5 tries which is 100% of the time.  I have learned that the calling party will hear up to 4 ring tones when placing a call on the ATT network.  If the ring tone changes volume slightly before the 4th ring then and only then will the cell phone start to ring.  If the ring tone does not change after the 4th ring you get voice mail.  If the calling party does not leave a voice message there is never a missed call displayed on the iphone.  If the calling party does leave a voice message a few minutes later the iphone dings for arriving voice mail but still no missed call indication. 
This appears to be related to the time of day and the ATT tower that the receiving caller is using.  Tried other towers and it works in 3G mode 10 times out of 10 tries.  Apple replaced the first iphone 4 with a new phone, no improvement.  ATT replaced the SIM card and no improvement.  ATT so far is clue less.  This has been going on every since we got the new iphones which is 4 months.  The ATT web site also describes this same problem from several years ago.  Has anyone got better information?
Thanks

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