I don't see a "block call" option when I press and hold number in history. The choices are "details", "delete" and "add to speed dial". I'm using a Lumia 521 and WP 8.1.
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2This question may already have an answer here How to find new Block and Filter app in windows 10 mobile? – Kolappan N Jan 13 '17 at 14:30
For enabling block number you have to go to Settings > Call +SMS filter Here you can turn ON or OFF call blocking as well as manage blocked numbers and use some advanced settings.
Hope this helps..
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1Note that Call+SMS Filter is actually an app; it should be pre-installed on Lumias but if it isn't (or doesn't work) you can find it in the Store and install/update it. – CBHacking Mar 22 '17 at 9:15
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microsoft.com/en-us/store/p/callsmsfilter/9wzdncrfj3jf?rtc=1 That is the link for the Call+SMS Filter App – Jim Jul 18 '17 at 22:03