I have an iphone 5 and am running ios 7 Beta 3. Only with Beta 3 have I had this issue. I was also not receiving calls, but all texts and voicemails were coming through. I tried calling my phone from 2 different phones with no avail. This is what worked for me. I did a HARD RESET, not a soft reset, but a hard reset (hold down home key and top power button together till the apple comes on and then turns off again) I waited about 3 minutes and then turned my phone back on. Haven't had another issue since! Hope this helps someone!!!