Iphone 6 plus can not receive or make calls

Intermittently, I can not eceive or make calls on my iPhone 6 plus.  Callers tell me that they call me, they hear the phone ring a number of times and it goes to voice mail.  I get the voice mail notification but my phone did not ring.  When I try to make a call, I get a recording that 'the number or code that you dialed is not valid.'  Other times the message is that I am not authorized to make a call on this device.  Other time it works fine.
I can not detect a pattern.  I reset the PRL ( Iuse Sprint).  I did a soft reset on phone.  I called Sprint and they did something on their end but it didn't work.  They told me to take the phone back to Apple.
Any suggestions?

I have this same problem and just finished speaking with AT&T (though I cannot make or receive any calls). The technical support staff opened a case. This problem seems like it may be related to the problem reported in the following threads:
iPhone 6 AT&T Activation Issues
and
http://forums.macrumors.com/showthread.php?t=1783862

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