Who called from 4242206077

collection company

its dex phonebook collection dept

re:  424-220-6077  ---   so this really is a dummy call from Dex phone book ??
It does make you worried.....but I know I do not have any unpaid invoices from Dex 1

No, that is not a "dummy call", this number is legit from Dex's collection department.  Unlike scammers, they'll leave their number and if you have a voicemail, etc, they'll leave contact info and what the call is about.

Did not answer. No voice message left.