You can't find you mobile phone, you have misplaced it or your phone has been stolen ... This tip can be useful. It will help you locate your phone before making any request to block your SIM card. Note that: These softwares must be installed and configured on the phone.
iPad and iPhone
Find my iPhone: This tool allows you to locate a lost iOS device or Mac.
BlackBerry Protect is a tool allowing you to locate BlackBerry phone if you ever lose it and perform remote actions to secure your data (lock the phone, wipe all data..etc). The BlackBerry Protect feature is by default integrated into the operating system of the BlackBerry ® 10 smartphones. For earlier models you can download the application for free: https://appworld.blackberry.com/webstore/content/20844/
This free service is accessible in the My Phone section of windowsphone.com. You can access this service from a computer connected to the Internet and from there perform several remote actions on your phone:
Locate your phone on a map
Lock the device
Clear the data stored on the phone
Some antivirus also allows you to locate a phone, remotely wipe the information stored on the device and lock the phone to prevent the use of a new SIM card ... Examples:
Kaspersky Anti-Virus will block your phone remotely just by sending a predefined SMS to your phone. You also have the possibility to erase your data remotely, to prepare a message to be displayed when locking the phone.
It is possible to subscribe to an insurance policy with its operator, distributors, banks. But those insurance are often expensive and does not cover all the risks. Verify that the insurance covers: thefts, pickpocketing, in haste, accidental damage... the type of reimbursement proposed to replace the phone, replacement of accessories, etc.