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The city of Christiansburg is in the state of Virginia. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 540 | 251 | Wireless | Omnipoint Communications Cap Operations, Llc | 07/06/2009 |
| 540 | 257 | Wireless | Sprint Spectrum L.p.- Va | 06/25/2002 |
| 540 | 260 | Landline | Lumos Networks Inc. | 08/20/2000 |
| 540 | 357 | Wireless | United States Cellular Corp. - Virginia | 03/03/2001 |
| 540 | 381 | Landline | Verizon Virginia, Inc. | 07/04/1995 |
| 540 | 382 | Landline | Verizon Virginia, Inc. | 07/04/1995 |
| 540 | 385 | Wireless | Omnipoint Communications Cap Operations, Llc | 06/23/2015 |
| 540 | 391 | Wireless | United States Cellular Corp. - Virginia | 08/14/1998 |
| 540 | 392 | Wireless | United States Cellular Corp. - Virginia | 08/14/1998 |
| 540 | 394 | Landline | Verizon Virginia, Inc. | 08/14/1998 |
| 540 | 449 | Wireless | New Cingular Wireless Pcs, Llc - Dc | 10/31/2000 |
| 540 | 585 | Landline | Telcove Of Virginia, Llc - Va | 01/10/2001 |
| 540 | 998 | Wireless | New Cingular Wireless Pcs, Llc - Dc | 11/19/2001 |
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