Have a brand new smartphone ? Be sure to first disconnect from the old one diligently and with grace.
1 - Make It Squeaky Clean
To ensure that the smartphone no longer contains your personal details, format the device. Use the Factory Format option, usually found in the Reset menu in Android or iOS settings - this will wipe the phone clean.
2 - Paying Forward
As a gesture of goodwill to the next owner, check the Software Version in the Settings menu to see if the device is running the latest software. Download any updates including the latest version of the OS or security patches before you proceed to format your phone clean.
3 - Cutting Ties
For security reasons, it is important that you unregister your device from your Google/Apple account so that it can no longer be linked to you. Head to Accounts in your Android or iOS device menu, select the Google or Apple account you used during the initial setup, and opt Remove.
@ Jackie San