Phone Prefix
(312) 221-XXXX
IL • CHICGOZN01
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Carrier Information
NANPA
State
IL
Region
MW
Rate Center
CHICGOZN01
Assigned To
T-MOBILE USA, INC.
OCN
6529
Status
AS
Date Assigned
Jun 20, 2011
Number Range
First Number
(312) 221-0000
Last Number
(312) 221-9999
This prefix contains 10,000 possible phone numbers
Spam Reports
5 reports
5
Total FCC + FTC DNC complaints for numbers in this prefix
Top 4 Most Reported Numbers
| # | Phone Number | Reports |
|---|---|---|
| 1 | (312) 221-2891 3122212891 | 2 |
| 2 | (312) 221-2454 3122212454 | 1 |
| 3 | (312) 221-4978 3122214978 | 1 |
| 4 | (312) 221-6621 3122216621 | 1 |
About This Prefix
Phone numbers starting with (312) 221 are part of the North American Numbering Plan (NANP). The first three digits (312) represent the Area Code (NPA), and the next three digits (221) represent the Central Office Code (NXX) or exchange.
- NPA (312) - Numbering Plan Area, identifies the geographic region
- NXX (221) - Central Office Code, identifies the specific exchange
- XXXX - Subscriber number (0000-9999)