no incoming calls-boost motorola i1

PLEASE HELP!
I HAVE THE MOTOROLA I1 AND EVERYTHING WAS WORKING FINE UP UNTIL 2 WEEKS AGO..HARDLY GET INCOMING CALLS GET RECORDING "PLEASE HOLD WHILE THE SUBSCRIBER YOU ARE TRYING TO REACH IS LOCATED"...BOOST IS NO HELP SAY IT IS THE CELL TOWERS..I NOTICE WHEN I HAVE THE WIFI SETTING ON I CAN RECEIVE CALLS OK AND THERE ARE NO "UP AND DOWN ARROWS LIKE I AM CONNECTED TO THE INTERNET" BUT AS SOON AS I LEAVE THE HOUSE THE "ARROWS" REAPPEAR AND AM HAVING SAME TROUBLE...QUESTION: HOW DO I DISCONNECT FROM THE INTERNET OR BROWSER OR TURN IT OFF SO I AM NOT CONNECTED CONSTANTLY TO THE INTERNET? WHEN THE ARROWS REAPPEAR I HAVE TROUBLE THANKS

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Sounds to me like a defictive phone,, this should be replaced under warranty.