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.

You can easily block a number on Google Voice, which provides you with a free number that you can use to answer calls from your computer or phone.

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.

Your phone number cannot be blocked while calling toll-free numbers or emergency services. The temporary way of keeping your mobile number invisible from caller ID is as easy as 1, 2, 3.

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.

Don't worry about downloading apps -- your iPhone already has several tools to block all those annoying calls and texts from random numbers.