Phone Prefix
(312) 399-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
RT
Number Range
First Number
(312) 399-0000
Last Number
(312) 399-9999
This prefix contains 10,000 possible phone numbers
Spam Reports
8 reports
8
Total FCC + FTC DNC complaints for numbers in this prefix
Top 8 Most Reported Numbers
| # | Phone Number | Reports |
|---|---|---|
| 1 | (312) 399-0426 3123990426 | 1 |
| 2 | (312) 399-3967 3123993967 | 1 |
| 3 | (312) 399-5846 3123995846 | 1 |
| 4 | (312) 399-6438 3123996438 | 1 |
| 5 | (312) 399-6835 3123996835 | 1 |
| 6 | (312) 399-7882 3123997882 | 1 |
| 7 | (312) 399-8127 3123998127 | 1 |
| 8 | (312) 399-9084 3123999084 | 1 |
About This Prefix
Phone numbers starting with (312) 399 are part of the North American Numbering Plan (NANP). The first three digits (312) represent the Area Code (NPA), and the next three digits (399) represent the Central Office Code (NXX) or exchange.
- NPA (312) - Numbering Plan Area, identifies the geographic region
- NXX (399) - Central Office Code, identifies the specific exchange
- XXXX - Subscriber number (0000-9999)