If you end up using RoboKiller and later decide not to use them make sure you follow the steps for disabling the service VERY carefully. Don't ask how I know this.Do the apps like TrueCaller and RoboKiller ALWAYS take over your voice mail? I've been reading that they use conditional call forwarding, which concerns me a little bit. I'd prefer to have something that has an advanced, always updating database that can simply silence the suspect spam call and let it go to my voice mail, rather than having the app redirect the call to their own servers... (as RoboKiller apparently does).