How to Block a Phone Number

Integrated Phone Number-Blocking Options

Google doesn’t build the capability to block calls into Android. However, some manufacturers add this feature to their custom skins. For example, some Samsung phones include this feature.
To use this feature, open the Phone app on a Samsung phone, tap the Menu button, and navigate to Call settings -> Call rejection -> Auto reject list. You can check the Unknown option to automatically reject all calls from “Unknown” numbers or tap the Create button and add individual phone numbers you want to block to the list.

Silence Calls or Send Calls to Voicemail

Android does provide a way to have specific numbers always go to your voicemail or play a silent ringtone that won’t disturb you if your phone is in your pocket.
If you set up this feature, you may still end up with voicemails from the number. However, if they’re a telemarketer, they likely won’t leave you a voicemail — so this feature may be more than good enough for blocking the most annoying telemarketers. If someone’s constantly leaving you voicemail messages, this won’t stop them.
To use this feature, just add the number you want to block to your contacts. You can do this by opening the Dialer app, swiping over to the history tab, and tapping the number. Tap the Add to contacts option and the number will be added to your phone’s contacts.

Go through the contact-adding process and name the contact. You could also add a contact manually, not from the dialer — just ensure the contact is associated with the phone number you want to block.

Once you’re done, go into the People app and tap the contact you added. Tap the menu button and select All calls to voicemail to automatically send the number’s calls to voicemail or tap Set ringtone and select None to associate the caller with a silent ringtone.

Block Calls With a Third-Party App

If you actually want to block calls and this feature isn’t integrated into your phone, you may want to try using a third-party app like Mr. Number. You can use apps like this one to automatically hang up on calls, effectively blocking them and preventing them from even getting to your voicemail.
Note that third-party call blocking apps always seem to have some mixed reviews. They don’t appear to work well for some people, and this may depend on your specific Android phone. If the above app doesn’t work for you, you may want to try another call-blocking app from Google Play.

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