You can locate your phone online if you have activated Find My iPhone (Apple) or Find My Device (Android).
If the phone has been stolen, report the incident at your nearest Police Station and provide your 15-digit IMEI number of the lost device to file a report. You can also request the Police to process a Warrant to assist in tracking the device.
Additionally, if your phone has M-PAiSA enabled, contact Vodafone and block your M-PAiSA account immediately to prevent any unauthorized transactions.