If you are planning to have a new Smartphone by selling the old one then it is important to perform some tasks in order to keep the private data private as anyone can retrieve the sensitive data using some software that you have deleted from your phone. Just deleting the data of phone is not enough rather you need to back up all the data before you remove everything completely from your phone so that all these data could be transferred to the new phone. The things that you should do before selling your phone are explained below. Backup all your data online This is the first and foremost step before selling the Smartphone. If you are having an android phone then backup all the data in Google Drive and in case of iOS device use iCloud for data backup. Images, videos, games, apps and the home Wi-Fi settings also could be saved in the iCloud and Google Drive. For Android devices such as Galaxy S9 go to settings>Account>Google account and select all the data you want to sync...