Rating Newest Oldest. Actually you can still use facebook messenger. Instead of it being connected to your account on fb it will ask you to log in with your phone number. So it creates an account separate from fb on the app and it's pretty awesome!I deactivated my account cause of my own reasons but wanted to keep in touch with people via the messenger app and you can!You can sync your contacts to it and it will show you all the contacts in your phone that is on the app.ctually you can still use facebook messenger. Instead of it being connected to your account on fb it will ask you to log in with your phone number.