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 you're sick of getting the same robocalls, or you need to excise another number out of your life, here's how to block any numbers/contacts on iPhone.

Stop unwanted calls and robocalls with simple, effective strategies. Learn how to use the National Do Not Call Registry, ...

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.

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