You have to get the serial number of your phone, bring that to the service/network provider you are into and ask to block the phone, they can also trace the phone.

Hello mam/sir have you kept the box packaging of your phone? there you can find the serial number of your phone, bring that to the service/network provider you are into and ask to block the phone,
or try to call your phone if itd dtill available, if some one answered it ask that person to bring it back......


good luck... god bless
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sexy-ym