For many people, cellphones are now their main communications device. Unfortunately, cellphones are also wildly insecure. In fact, they are a data collector’s dream. You can, however, secure some of your phone communications using Signal, which can encrypt text messages and phone calls.

If you’re using an Android phone, Signal will automatically activate between two Signal users. If the person you are communicating with isn’t using Signal, your communications switch into unsecured mode automatically. With an iPhone, you have to turn Signal on and off yourself, but this is quick and easy to do.