Numbers with this prefix were first introduced in 2008.
While 7736723207 was originally issued with the info above, the owner of the phone number (773) 672-3207 may have transferred it through a process called porting.
User Complaints for (773) 672-3207
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Caller type: Unknown
Called close to 9 pm. CID showed Unavailable. I let it go to VM, but no message was left, indicating that this was not a legitimate caller.