Hope this helps a few of you with your phone not ringing. After plenty of troubleshooting I finally called tech support & they were very helpful. After discussing all of my troubleshooting they decided to just reset the SIM card & voila, worked like a charm. Apparently while traveling the phone pings off of different towers. Once in awhile it will get stuck on a tower & when you arrive at your destination it cannot lock on to the new, closest tower. Resetting the card is all it took. They are mailing me a new SIM card free of charge in case it happens again. My phone is a Droid Razor Maxx & I have had it for two years. Works beautifully but I am good for an upgrade & hubby has the Galaxy 5 which has a much better camera. In fact, it takes great pics so I may have to get a new Galaxy 6 in the near future. Anyway, thanks to tech support & I hope this helps a few of you as well. Have a great day!