Theyre is an option to block contacts from messaging/calling you but i havent had a need to use it yet so no idea if its works!! I had similar features on other devices however that didnt work, I know if your with vodafone they offer an app called safetynet which is actually designed to protect kids and it is a very handy app to have installed but its only available from vodafone and doesnt work on all handsets but i believe it works with most android devices