If you receive unwanted calls to your phone number on an iPhone, texts or iMessages in the Messages app, or unwanted incoming calls in FaceTime, you can block them by phone number or email address ...

Blocking a sender from an email they sent The easiest way to block someone on Gmail is from an email you received, whether you use a computer or the Gmail app on your phone.

You can block the sender of a spam group text on your iPhone and set up a filter to prevent such texts from reaching your Messages inbox.