How to block a phone number using Google Messages Google Messages, titled Messages on your phone, is the default texting app that's preinstalled on most Android devices.

A smartphone keeps you in contact with the rest of the world, but not all text messages are desirable. Here's how to block text messages on iPhone and Android.

To block telemarketing calls, you can register your number on the Do Not Call List. Legitimate telemarketers consult the list to avoid calling both landline and wireless phone numbers.