"not in service" means the calling number is spoofed https://en.wikipedia.org/wiki/Caller_ID_spoofing and your caller should be treated as hostile.
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Recent comments:
1
Jan 19, 2013
Received a call saying I had done a online survey and in the survey mentioned I was interested in job opportunities. This came on my work phone that I do not use for any other calls. Scam.
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2
Jan 19, 2013
I too just got a call saying i did an online survey for job opportunities and of course I have not did any surverys. I hung up on them.
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3
Jan 28, 2013
Caller I'd shown a call from 801-893-3018
No one was there , but when try to call them back got my service signal calls can't be completed , either they forward the number to a bogus phone number or they have fake caller Id .
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4
Jan 28, 2013
Answered and nobody was there. Waited a minute and heard a weird beep sound. The call ended on its own. Weird.
Other
5
Jan 28, 2013
Recieved a call that said "you are currently the only person in this conference call" nothing, a beep and it hung up.