In Everyday life, New Technology is being develop in every second. Every month new devices are launched of different Brands. Some people wants to try every new devices and sell their old devices.
So, Before selling your devices there are some thing you must do.....
1-Back up your data
Biggest concern when backing up data is saving their photos and videos. If your device has an SD card, it may be as easy as removing the card and connecting it to a computer. If the multimedia is stored on internal memory, you'll need to connect the device to a computer via USB cable. Once connected, you'll be able to drag and drop any files you want to keep onto your computer.
2-Back up your Texts and call log
If you’re concerned about keeping a copy of your text messages and call log, you’ll want to back up those separately. One of the easiest to use is SMS Backup + (free in Google Play). The app stores each entry in a folder in your Gmail.
3-Remove SIM card
Most phones and many tablets use these to access a cellular network for voice, text, and data.
If your device has a removable back, chances are the SIM card is visible once the back cover and/or battery are removed. Devices without removable back panels should have a SIM card slot somewhere along the device's outside edge — a special tool that came with the device may be needed to pop the SIM card out.
4-Encrypt and Factory data reset your device
When your are 100% sure you have everything you need as backed up, you can wipe your device clean. There are a couple ways to do this. You can boot into recovery and use the factory reset/wipe data command, or go to Settings > Backup & reset > Factory data reset. This will erase everything on your device.
Charge your devices fully because new owner need to check your device's functionality and working.