Searching other sites, this seems to be a scam call.  I do not answer unknown #'s as I understand some can cause extreme back charges.  This one, as is so common, says (after checking it on the internet first) out of service, which to me is a scam call alert!

This guy is an [***]. He calls every few hours. Guess he likes me.

I keep getting a call every day from this number and they just listen to me. I will no longer answer!!!!!