Smartphones, such as handsets running Google Android, contain a lot of personal data, such as emails, contacts and even sign-in details for social networks such as Facebook. However, this can cause a problem when you decided to swap your existing handset for a new one.

Perhaps you're giving your old handset to a friend or family member. Alternatively you may be selling it on eBay or cash for phone services like Mazuma. Either way, it's wise to remove all your personal data before you pass it on. A Factory reset is the best way to do this.

It's also worth remembering to remove the phone's SIM card and memory card before you pass the handset on.

Here's how to do a factory reset on a Google Android device.

Step one
From the home screen open the Settings Menu and then select Privacy.

Step two
Select Factory data reset. You'll be asked to confirm you want to erase all of the data, including files stored on the SD card, apps and their data. Press Reset Phone and your data will be erased.