No longer receiving or sending calls but everything else works

[jillybean2]

I have a Iphone 6 and it was working fine until two weeks ago when it stopped receiving or sending calls. All other features work, I have been to the Verizon store 5 times and restarted everything, new sim card, worked with support tech, been to Apple and replaced to a new phone but it still is not receiving or sending calls. I get a fast busy signal when calling out and if you call me it says my number is disconnected.  Any suggestions?