Android 3.0+ has it as an option; I believe iOS does it automatically if you set a pass code. Can't speak to the actual security of either though. PS: this doe

Android 3.0+ has it as an option; I believe iOS does it automatically if you set a pass code. Can't speak to the actual security of either though. PS: this does nothing against phone numbers and text messages stored on your SIM (the vast majority of smartphones no longer do this, AFAIK)