How to block unknown (withheld, restricted) numbers on Android 4, 5, 6

Here is our step-by-step guide on how to block annoying calls from unknown (withheld, restricted, private) phone numbers on Android. We will show how to do this on Samsung Galaxy Ace III GT-S7272 under Android 4.2.2. The steps to block calls from unknown numbers on Android 5 and 6 are exactly the same.

How to block calls from unknown/restricted/withheld numbers on Android 4, 5, 6

Go to Settingsandroid4-settings


Select My device and tap on Call category:


Choose Call rejection:


Check that the black list function is enabled. (The Auto reject numbers should be chosen in Auto reject mode setting).
Then enter the Auto reject list setting:

unknown to blacklist: auto reject list

Check the flag Unknown to add all unknown callers to black list:

add unknown withheld numbers to blacklist

Henceforth, all incoming calls from restricted (unknown, withheld) numbers would be automatically rejected.

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