I didn't recognize the number, so the call went unanswered. No voicemail was left, however a quick search gave a couple brief details about this number being a Cingular Wireless mobile phone number from Baltimore, Maryland.
I received a call from this number about 5 minutes ago. I answered but didn't speak then a recorded voice said, "I'm sorry, that is not a valid extension. Goodbye."
Weird how the number calling me would tell me *I* don't have the valid extension. It's probably a scammer or the like testing random phone numbers to see which ones are real.