Fine My Phone in Windows Phone 8 - Step by step with Screenshots
With Find My Phone in Windows Phone 8, you can ring, lock, erase, or
show your phone on a map from any Internet-connected computer. To do
that, open windowsphone.com on your computer. Move the mouse to the
phone in the upper-right corner, and click
Find My Phone. If
you're prompted, sign in with the same Microsoft account you used to
sign in on your phone.
After sign in, you have Ring, Lock and Erase options.