zte merit has 4 bars but I cant make calls

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http://androidforums.com – I have a merit that used to work just fine. Now (when it works) it just drops calls even though I have a good signal. Most of the time I cant even make a call even though I have a strong signal the thing just says dialing and then call ended. Sometimes it just starts calling the last number, on it's own, and then hangs up and redials again doing this 2-3 times in a row. I spoke with Straight talk but can not afford to be without a phone for two weeks while I send mine in and wait for processing and shipment of the new phone. I have done a hard reset and still the same problem. Any ideas Mr. ZT (General)