Who called from 6103511605

I don't answer private or blocked calls. Didn't answer. Called back, it was Portfolio Recovery Services.

Called looking for someone (not me)

Report them. Read up before you do.
https://www.consumer.ftc.gov/articles/0117-time-barred-debts

Called cell, no message left, added to reject list...tried to settle over 10 years ago with original, portfolio is 4th scum ...

Portfolio Recovery Service. These people call from multiple numbers from different areas codes trying to collect on a debt that hasn't been owed on for  several years. These pieces of crap are annoying