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| Raw Number | 331203 |
| Basic Format | 331-203 |
| NPA (Area Code) | 331 |
| NXX | 203 |
| NPA-NXX-X | OCN | Company | Rate Center | Use Type | Assign Date | State | Region | Block Effective Date |
|---|---|---|---|---|---|---|---|---|
| 331-203-0XXX | 6529 | T-MOBILE USA, INC. | AURORA | AS | 10/14/2011 | IL | MW | 11/26/2011 |
| 331-203-1XXX | 6529 | T-MOBILE USA, INC. | AURORA | AS | 10/14/2011 | IL | MW | 11/26/2011 |
| 331-203-2XXX | 6529 | T-MOBILE USA, INC. | AURORA | AS | 10/14/2011 | IL | MW | 11/26/2011 |
| 331-203-3XXX | 6529 | T-MOBILE USA, INC. | AURORA | AS | 10/14/2011 | IL | MW | 11/26/2011 |
| 331-203-4XXX | 6529 | T-MOBILE USA, INC. | AURORA | AS | 10/14/2011 | IL | MW | 11/26/2011 |
| 331-203-5XXX | 6529 | T-MOBILE USA, INC. | AURORA | AS | 10/14/2011 | IL | MW | 11/26/2011 |
| 331-203-6XXX | 6529 | T-MOBILE USA, INC. | AURORA | AS | 10/14/2011 | IL | MW | 11/26/2011 |
| 331-203-7XXX | 6529 | T-MOBILE USA, INC. | AURORA | AS | 10/14/2011 | IL | MW | 11/26/2011 |
| 331-203-8XXX | 6529 | T-MOBILE USA, INC. | AURORA | AS | 10/14/2011 | IL | MW | 11/26/2011 |
| 331-203-9XXX | 624H | ONVOY SPECTRUM, LLC | AURORA | AS | 10/19/2023 | IL | MW | 11/17/2023 |
| 331-203-XXXX | 6529 | T-MOBILE USA, INC. | AURORA | AS | 10/12/2011 | IL |
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