How does it work?
The “Remote Lock and Protect Your Lost Phone” app needs to be installed
on your mobile phone while you still have it.
During installation you enter a code word. After you lost your mobile phone, you
can use any other mobile phone to send it an SMS text message with content: lock
code word. Your lost phone will lock the main screen and reply with an SMS text
message to confirm. To unlock you need to enter the code word on the mobile phone
directly or send it an Unlock SMS text message. And no, restarting the phone will
not do the trick so better be careful to remember your code word! Also removing
the mobile app is code word protected. Easy peasy.