received call on my cell--just curious

Crooked Visa/Master Card scam promising to "Lower your interest rate to as little as 6%."

Hey, NOBODY in the U.S. is offering less than 12%.

Hung up on me when I told them I thought they were thieves and threatened to call the FBI.

Voice had a heavy African accent -- I'm suspecting they are calling from Nigeria.

I also just got a call on my cell phone form253-236-2058.  Did you figure out who it was?

I just received a call from this number and I didn't answer, it is most likely a telemarketer because there wasn't a voice message left.

recording stating that I can lower my credit card interest to 6.5% -- I don't have ANY credit cards.