App to find a lost phone

[Lindat]

I was browsing through the App store ages ago, and I recall seeing some really good apps for finding your phone if it gets stolen. One in particular I remember it would email you with the exact location using GPS. Does anyone know what this app is? What do you all think is the very best app to locate a stolen phone (or ipad now). I've tried typing in phone locator or lost phone etc. but I can't find much in the store. I know I can rely on you guys for finding what I'm looking for. Thanks.