 Which is to say, if there's somebody in your family that is more susceptible to scams, turn on these settings in their phone. Make it so that any calls that aren't from people saved in their address book go directly to voicemail. Put their text messages on the setting that's only showing known texters and not unknown texters. They vary from phone to phone, but they're pretty easy to find if you look up your phone settings. Thanks, Heather. Heather Kelley, tech reporter at The Washington Post. Coming up next, why heat makes us cranky.