Caller: Pendrolian Pendralis

This unknown number [first red flag] 0458 699 730) called my confidential mobile number today [2nd Red Flag], so I let it ring out (ass is my usual protocol with unrecognized calling numbers - especially with that number). The caller did not leave any message [3rd Red Flag], nor did they follow up with any SMS message in the minutes after that [4th Red Flag].
So then, as is my usual next step with such numbers, I threw it into google search and also here, but came up with no prior form on it [Green Flag].
Next I phoned the number from my other everyday mobile number [WITH NUMBER SENDING OFF] and the number didn't even ring once but it seems was terminated ('Call Ended') as immediately as it was connected [5th Red Flag]. So then I phoned the number again from my everyday mobile [this time with my number sending ON], and yet again, it seems the call terminated ('Call Ended') before it even rang once [6th Red flag]. So I left it a couple of hours or so, and in that time there was no still no futher follow up call attempts or SMS messages frim that number on either of my mobile numbers [7th Red Flag]. So I gave the number further two calls, but each thus time from a different and unassociated land line number, and yet again, on both call attempts, got the same kind of immediate disconnection [8th Red Flag].
8 Red Flags vs 1 Green Flag.
So I then deemed the number as being both a significantly suspicious as well as nuisance caller, and has earned a place on my BLOCKED numbers list, and I think has also earned being registered here with it's first 'form'.
Cheers.