Not a new problem.
I got my first Nigerian Scam Deaf Relay Call last May, on my cell phone.
I had to listen to them for a minute or two to make sure it wasn't
one of my European customers having a network problem,
but it was somebody who said they wanted to discuss a business opportunity -
on Sunday night of Memorial Day Weekend, so they weren't thinking
about the fact that they were calling America.
Unfortunately, there didn't seem to be procedures for asking the
operator to trace the call once it became clear that it
really was a Nigerian scammer finding a new and creative
way to abuse somebody's resources.
[This email is my personal opinion, not AT&T's,
but it was really annoying to have them abusing my company's service
this way and interfering with legitimate users.]