Who called from 7739450201

I have been receiving calls from this number but they don't leave a message I have no idea who this is or how they got my number and I will not call them back.

Caller ID said Opinion Research.  Didn't answer the call.

there was a message but left before machine could capture enough to make any sense of it. Maybe a robocall. first call in Oregon on 1-20-12

I just received a call from this number (03/03/2012). I did not answer, but my guess is that it's a research\telemarketer number as I seem to get those a lot on my phone. No voice mail was left, and they haven't called back, so it must not have been a personal call.

I did not answer.