There are built-in ways to do that# Android: android.com/find iPhone: find my iPhone, find my friends. I think I trust Apple's implementation more. Also,

There are built-in ways to do that# Android: android.com/find iPhone: find my iPhone, find my friends. I think I trust Apple's implementation more. Also, SnapChat has a similar platform-agnostic feature, if you're willing to give them your data.