Article: This app reviews incoming calls, and can be set to reject all unknown calls (including all numbers which aren't in your contacts). To download it, open the {"smallUrl":"https:\/\/www.wikihow.com\/images\/1\/1e\/Androidgoogleplay.png","bigUrl":"\/images\/thumb\/1\/1e\/Androidgoogleplay.png\/26px-Androidgoogleplay.png","smallWidth":460,"smallHeight":531,"bigWidth":"26","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of an Android icon\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"} Play Store, then do the following:  Tap the search bar. Type in should I answer  Tap Should I Answer?  Tap INSTALL  Tap ACCEPT Tap OPEN in the Google Play Store, or tap the octopus-shaped Should I Answer? app icon in your Android's App Drawer. It's at the bottom of the screen. You'll find this at the top of the screen. It's near the middle of the Settings page. Tap the white switch {"smallUrl":"https:\/\/www.wikihow.com\/images\/d\/d5\/Android7switchoff.png","bigUrl":"\/images\/thumb\/d\/d5\/Android7switchoff.png\/35px-Android7switchoff.png","smallWidth":460,"smallHeight":394,"bigWidth":"35","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of an Android icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"} to the right of any (or all) of the following:  local negative rated numbers community negative rated numbers numbers not stored in contacts hidden numbers foreign numbers If you want to prevent unknown/non-contact numbers from being able to text you, scroll down to the "Block INCOMING SMS" section and tap the white switch(es) next to the option(s) you want to implement. Your settings will be saved. From now on, calls from unknown numbers should be blocked.

What is a summary?
Download the "Should I Answer?" app. Open Should I Answer. Tap CONTINUE. Tap the SETTINGS tab. Scroll down to the "Block INCOMING Calls from" heading. Enable call-blocking for incoming calls. Disable incoming texts if needed. Exit Should I Answer.