If you're positive it's a cell phone number then no, you're screwed. Each service provider used to carry their own prefixes when activating lines, but now that you can port your number to another provider, there's no telling. You can always Whitepages.com and do a reverse phone search to see which carrier it was initiated with. Depending on your location, you may be able to narrow the search down. Or, just post the number on here and we'd all call them.
And damnit, I hate hate hate when I pick up the landline and have to say "Hello?" twice. That's when you know it's a telemarketer. My friend who does it for a living says the pause is there because they've got to get their computer ready for long-term notes. Their system doesn't give the the note taking prompt until they call. Those bastards. The other day at work, I got a call (on our work line!) letting me know that I won a 6 day, 5 nights trip to Six FLags. Who wants to come!?
