If no steps are taken to secure a stolen phone, it may offer the thief access to a range of personal details and information. To prevent this from happening, it’s first important to add password and facial recognition technology to your smartphone to stop a thief from using the device. If the phone is stolen, it’s also important to contact the SIM network provider immediately, so they can block the phone's ability to make calls and send messages. A phone network provider can also block a phone's international mobile equipment identity (IMEI) code to prevent the phone from being used entirely. If you have backed your phone up to the cloud you could consider remotely wiping the phone's data.