Report the police and mobile service provider to deactivate the mobile sim. Then you will get new SIM and this will be activated without changing number.
Immediately Report to police station and file a compliant,take this copy to your service provider and get your new sim.. But forget about your mobile there is no way get back...
When you lose your mobile it is important to register an FIR at the nearest police station and get the general diary number. Then deactivate your sim card by calling your service provider and take a duplicate sim with the same number or get a new sim....