Use the following advice to make your mobile phone or tablet more secure: Set a password, Personal Identification Number (PIN), passcode, gesture or fingerprint that must be entered to unlock the device. Don’t forget to put PINs on your SIM card and voicemail, and ensure your device is set to automatically lock. Install reputable security software that includes antivirus and anti-theft/loss protection – your device’s retailer or service provider can provide recommendations. Only install applications from the official device application store and do not 'jailbreak' your device. Use your device’s automatic update feature to install new application and operating system updates as soon as they are available. Set the device to require a password before applications are installed. This will prevent unauthorised modifications to the device. Parental controls could also be used for this purpose. Leave Bluetooth turned off or in undiscoverable mode (hidden) when you are not using it. Ensure your device does not automatically connect to new networks without your confirmation. Record the International Mobile Equipment Identifier (IMEI) of your handset. Your IMEI is a 15 or 17 digit number often printed on a label under the battery or found in the settings under general information about your device. If your device is lost or stolen, report this number to your provider and they can stop the handset from being used. Enable the remote locking and/or wiping functions, if your device supports them.