I PORTED FROM MTN TO CELL C A WEEK AGO AND MY NUMBER FROM MTN IS DESTROYED, PORTING DOES NOT WENT WELL. NO NETWORK SIGNAL ON MY PHONE. "SIM CARD REGISTRATIONFAILURE " THIS MASSEGE APPEAR ON MY PHONE EVERY TIME I SWITCH ON . PORTING DEPARTMENT SENT ME THE REFERENCE NUMBER 835758 WHICH I DO NOT KNOW WHAT MUST I DO ABOUT IT. read full review »