afaik you have to bring the receipt and the box with you. dapat nandun yun imei number. but the badnews is sa greenhills pati imeinumber e naaayos na nila. if you got namna your phone sa globe smart or sun you can just bring it to them sila na mag block. just make sure the phone is registered sa ntc. some grey if not most of grey market phones are not registered with the ntc.