This problems could caused by cell phones providers wars,like cell phones carriers only have the same networks could talk to each other.U tries it with other cell phones see if this problems can be solved or u could be out of range of cell phones towers transmissions signals.
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This problems could caused by cell phones providers wars,like cell phones carriers only have the same networks could talk to each other.U tries it with other cell phones see if this problems can be solved or u could be out of range of cell phones towers transmissions signals.