Community members have submitted 3 distinct reports about 8552916646 between August 2017 and September 2017, describing experiences with suspicious calls.
Here is what people are reporting:
"A new list of Microsoft scam numbers (w/ pictures) 855-291-6646 Your computer has been locked!
https://cdn.discordapp.com/attachments/337775503413084161/347945216579469315/VirtualBox_Windows_Vista_17_08_2017_23_29_56.png
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"Another small load of a fresh numbers (w/ pictures) 866-811-6252
https://cdn.discordapp.com/attachments/337775503413084161/348615594578280459/VirtualBox_Windows_Vista_17_08_2017_23_31_57.png
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844-489-4777
https://cdn...."
"855-291-6646 Pop-up window says RDN/Trojan.worm infection, call Microsoft Technical Support. Website has bright red background with white text. Makes an alarm sound."
Reports come from 2 from reddit, 1 from unknown.