How to block phone calls on your Android phone

You can follow the screenshots below. Start by hitting Phone > Menu > Call settings > Call rejection > Auto reject list. You can auto reject all Unknown numbers by simply ticking the box or you can tap Create and enter specific numbers or contacts into this list. You can also do this from the Contacts app by navigating to the contact you want to reject calls from and hitting Menu, then selecting Add to reject list.

You can also reject calls with a text message by dragging Reject call with message up when a call comes in and selecting the text message you want to send. If you want to write your own then go to Phone > Menu > Call settings > Set reject messages.
If you want to send callers straight to voicemail on stock Android the process is pretty simple. Go to the contact in question and hit Menu > Options and then check Incoming calls (Send calls directly to voicemail).
All Android smartphones should have some variation of this option to auto reject calls from specific contacts. Unfortunately sometimes carriers mess around with it because they want to offer services of their own. You’ll generally find call blocking options in Parental Controls for all the major carriers, but they might charge you for the privilege.

Using Android apps to block calls

If none of the other options suits you or you just want a more user friendly way of blocking calls on your Android smartphone then a dedicated app might be your best bet. Here are three solid options.

Mr. Number Text, Call & Block (Free)

This app bills itself as a free alternative text and calling app, with free messaging between members and real-time updates on when your messages have been read. It also happens to be a powerful call and text blocking app for Android. You can block specific numbers or you can block area codes. Thanks to user submitted info on telemarketers and other spam you can create a block list that will protect you from cold calls.

Call Control – Call Blocker (Free)

Here’s another Android call blocker with a big list of user submitted spam numbers that you can automatically block. This one also ties in with the FCC Do Not Call registry. You can decide which calls get blocked and exactly how they are handled with this versatile app. You get a free 14-day trial of the full app and then it reverts to a limited “Lite” version, unless you cough up a few dollars ($8).

Extreme Call Blocker ($6)

Pay a one-off $6 fee and you’ll get a comprehensive call and text message blocking app that’s password protected and packed with features. You can send calls direct to voicemail, pick up and hang up automatically, or just mute the ringer. You can also use this app to block outgoing calls and it has a stealth mode so the app can be hidden on a phone. This is a solid option that offers good call blocking control and the ability to set up profiles with various parameters.