This is a business cell phone and I received a call from this number as well as one listed as "Unavailable" on my phone.  Both of them had a person on the other line who kept saying "Addo...ahhh.. yes yes" or "Addo...yes yes" repeatedly in response to anything I said.  I guess they were trying to fake an accent or that was their real accent, so Hello sounded like Addo.  They finally said Bye bye at the end, and until I said bye back, they didn't hang up.  It was very irritating.  I tried to call the number back but it said it was a non-working number.  This person or thing called back again the next morning, but the caller ID was Unavailable this time.  I answered...and they said the whole... "Addo...yes yes" thing, and I did not respond to him.  And within 8 seconds, the caller hung up.  I am thinking this is more a prank call than some telemarketing or financial scam like many of the other numbers I've researched on here.