Phone Prefix
(312) 921-XXXX
IL • CHICGOZN01
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Carrier Information
NANPA
State
IL
Region
MW
Rate Center
CHICGOZN01
Assigned To
ILLINOIS BELL TEL CO
OCN
9329
Status
AS
Date Assigned
Jul 22, 2008
Number Range
First Number
(312) 921-0000
Last Number
(312) 921-9999
This prefix contains 10,000 possible phone numbers
Spam Reports
12 reports
12
Total FCC + FTC DNC complaints for numbers in this prefix
Top 11 Most Reported Numbers
| # | Phone Number | Reports |
|---|---|---|
| 1 | (312) 921-7882 3129217882 | 2 |
| 2 | (312) 921-3410 3129213410 | 1 |
| 3 | (312) 921-3966 3129213966 | 1 |
| 4 | (312) 921-4150 3129214150 | 1 |
| 5 | (312) 921-4454 3129214454 | 1 |
| 6 | (312) 921-5646 3129215646 | 1 |
| 7 | (312) 921-7074 3129217074 | 1 |
| 8 | (312) 921-8796 3129218796 | 1 |
| 9 | (312) 921-9427 3129219427 | 1 |
| 10 | (312) 921-0991 3129210991 | 1 |
| 11 | (312) 921-9753 3129219753 | 1 |
About This Prefix
Phone numbers starting with (312) 921 are part of the North American Numbering Plan (NANP). The first three digits (312) represent the Area Code (NPA), and the next three digits (921) represent the Central Office Code (NXX) or exchange.
- NPA (312) - Numbering Plan Area, identifies the geographic region
- NXX (921) - Central Office Code, identifies the specific exchange
- XXXX - Subscriber number (0000-9999)