What to do with your old Android phone before selling it

[johnypowas]

If you want to give away or sell your old smartphone or tablet, there are some important things that you do first, so that you don't accidentally pass on your personal information to someone else. We’ll explain how to clean up your device so it's good as new before it changes hands, and also suggest some places to donate or sell your device if you do decide to sell an old Android phone.
No matter who your old phone or tablet goes to, you should always wipe it (inside and out) before you give it to them. The main reason for this is to protect your privacy, but it will also make it easier for them to set it up anew. There are several important things to do when removing your data from your old Android phone, which are detailed below.  
Erase your data
The next thing to do is to wipe your data from the phone itself. There's two simple ways to do this: either go into Settings and look for the backup/restore section, or do it manually with hardware buttons. Make sure you have a full backup of all your data before you take this step!
Also, it is important to ensure you have signed out of your Google account (and Samsung account, if applicable) before you wipe your phone. Otherwise, the person who receives your phone may not be able to activate it, since the device will be locked with your password.
The following data is deleted:

• Google account settings 
  
• Settings configuration data and applications
  
• Installed apps
  
• Music
  
• Photos
  
• Other user data
  
• Linked accounts (Facebook, Dropbox, Twitter, etc.)