what software to locate lost phone with GPS

there are also 2 other programs that i kno of that u can do this with...one called VITO FIND ME...vito is the maker of course...then another called W.I.M.P...stands for where is my phone...i have these both but i dont have either installed right now...vito u set it up to where u text a certain passcode from any cell phone and it will in return send u the location cordinates of ur phone...W.I.M.P. i havent even used or installed for that matter...neither of these are free tho...not legally that is...so u might be better off using the one darren suggested but i thought id atleast let u kno of these 2 options