This article describes how to deactivate your Facebook account from an Android device. It also explains what deactivation means for your account and for Messenger.
It’s easy to deactivate a Facebook account through Accounts Center, which is accessible from the app’s menu. You can choose when, if ever, you want to automatically reactivate your account.
Select your profile picture at the top of the app to open the menu.
Select the small gear/settings icon at the top.