Hy! It depends on what is your mobile! If you have a windows phone you have to sign in that account which one you set on your phone. If you sign in with the correct e-mail adress, it will show you your phone(s). For example: I sign in, and I see it: Puposbali phone(s): Lumia 730. And next to it i can choose an option what am I want! I can ring/locate/lock/format the phone, and I can send a text on the screen. And it's work properly! It works, when your phone is off! And you have to do the same the other 2 platforms!