---> Rachel claimed, "unknown number calling" <---

No it isn't.  You can look it up yourself using:
http://www.anywho.com/reverse-lookup

I suggest that you and others posting one-time queries learn of these free reverse phone number look-up sites.  They won't give you the names associated with mobile phones, but you can at least see that they are mobile phone numbers by clicking on a link on the "We didn't find any results for ..." under the heading "Additional Resources."  The link is entitled, "Additional Phone Searches."

I do not want to suggest in any way that the person listed in "anywho.com" is associated with any scam or otherwise deserves any adverse publicity.  You didn't say you were victimized in any way except perhaps by an innocent misdial, after all.  It isn't unknown for fraudsters to spoof a real number of an unsuspecting but innocent telephone subscriber.  But I think that probably isn't what happened here.