If you don't want people to know you're calling, you can hide caller ID by blocking your own number on both landlines and smartphones.

If an unknown number calls, users can manually block those callers through their recent call log or by using a third-party call-blocking application, such as Hiya, RoboKiller or Truecaller.

No matter what type of smartphone you're using, we can help you avoid all of those pesky robo and sales calls. Here's how to block a number on any smartphone.

From Google Voice, you can block a phone number from ringing on your cellphone with call rules designed to help you filter your incoming calls.

On Android Phones To block a recent number, open your device's default Phone app and tap on the recent calls list---it's the little clock in the top-middle of the screen.