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The city of Mission Viejo is in the state of California. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 949 | 203 | Landline | Matrix Telecom, Llc. Sii Tnci - Ca | 05/18/1998 |
| 949 | 210 | Wireless | Usa Mobility Wireless, Inc. | 05/10/1999 |
| 949 | 243 | Landline | Pacific Bell | 05/10/1999 |
| 949 | 256 | Wireless | 33 Wireless Inc. | 07/22/1999 |
| 949 | 268 | Landline | Paetec Communications, Inc. - Ca | 10/13/1999 |
| 949 | 273 | Landline | Level 3 Communications, Llc - Ca | 10/13/1999 |
| 949 | 277 | Wireless | Utility Telecom Group, Llc - Ca | 05/10/1999 |
| 949 | 282 | Landline | Pacific Bell | 10/13/1999 |
| 949 | 282 | Landline | Pacific Bell | 10/13/1999 |
| 949 | 297 | Landline | Level 3 Telecom Of California, Lp - Ca | 01/14/2000 |
| 949 | 301 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 02/10/2016 |
| 949 | 309 | Landline | Broadwing Communications, Llc - Ca | 06/13/2000 |
| 949 | 318 | Wireless | Utility Telecom Group, Llc - Ca | 06/13/2000 |
| 949 | 322 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 05/10/1999 |
| 949 | 327 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 09/28/2015 |
| 949 | 328 | Landline | Mpower Communications Corp - Ca | 06/13/2000 |
| 949 | 330 | Landline | Teleport Communications Group - Los Angeles | 06/13/2000 |
| 949 | 340 | Landline | Broadwing Communications, Llc - Ca | 06/30/2001 |
| 949 | 347 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 347 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 348 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 348 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 353 | Wireless | New Cingular Wireless Pcs, Llc | 09/03/2014 |
| 949 | 354 | Landline | Matrix Telecom, Llc. Sii Tnci - Ca | 01/28/2002 |
| 949 | 356 | Landline | Cf Communications, Llc Dba Telekenex - Ca | 06/29/2011 |
| 949 | 364 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 364 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 365 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 365 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 367 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 367 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 382 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 11/20/2008 |
| 949 | 393 | Landline | Bandwidth.com Clec, Llc - Ca | 02/01/2013 |
| 949 | 420 | Landline | Allegiance Telecom, Inc. - Ca | 05/10/1999 |
| 949 | 427 | Landline | Level 3 Communications, Llc - Ca | 11/22/2010 |
| 949 | 445 | Landline | Centurylink Communications Llc | 02/04/2013 |
| 949 | 505 | Wireless | New Cingular Wireless Pcs, Llc | 02/24/2010 |
| 949 | 521 | Wireless | New Cingular Wireless Pcs, Llc | 02/22/2001 |
| 949 | 523 | Landline | Teleport Communications Group - Los Angeles | 09/21/2015 |
| 949 | 525 | Landline | Level 3 Communications, Llc - Ca | 05/10/1999 |
| 949 | 528 | Landline | Matrix Telecom, Llc. Sii Tnci - Ca | 05/10/1999 |
| 949 | 532 | Wireless | T-mobile Usa, Inc. | 04/23/2015 |
| 949 | 540 | Landline | Mpower Communications Corp - Ca | 07/22/1999 |
| 949 | 544 | Landline | Global Crossing Local Services, Inc.-ca | 05/10/1999 |
| 949 | 575 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 01/25/2016 |
| 949 | 582 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 582 | Landline | Pacific Bell | 05/18/1998 |
| 949 | 600 | Landline | O1 Communications, Inc. - Ca | 05/10/1999 |
| 949 | 616 | Landline | At&t Local | 02/27/1999 |
| 949 | 628 | Wireless | American Messaging Services, Llc | 07/22/1999 |
| 949 | 632 | Wireless | New Cingular Wireless Pcs, Llc | 04/19/2001 |
| 949 | 633 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 05/10/1999 |
| 949 | 636 | Wireless | New Cingular Wireless Pcs, Llc | 04/19/2001 |
| 949 | 638 | Landline | Level 3 Telecom Of California, Lp - Ca | 10/21/2008 |
| 949 | 647 | Wireless | New Cingular Wireless Pcs, Llc | 10/20/2014 |
| 949 | 652 | Landline | At&t Corp. | 05/13/2016 |
| 949 | 667 | Landline | Telcentris Communications, Llc - Ca | 07/21/2010 |
| 949 | 680 | Landline | Level 3 Telecom Of California, Lp - Ca | 05/10/1999 |
| 949 | 683 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 11/20/1998 |
| 949 | 690 | Wireless | T-mobile Usa, Inc. | 09/20/2002 |
| 949 | 740 | Wireless | American Messaging Services, Llc | 05/10/1999 |
| 949 | 767 | Landline | Matrix Telecom, Llc. Sii Tnci - Ca | 05/18/1998 |
| 949 | 860 | Landline | Teleport Communications Group - Los Angeles | 05/18/1998 |
| 714 | 877 | Wireless | Utility Telecom Group, Llc - Ca | 01/25/1998 |
| 949 | 884 | Wireless | American Messaging Services, Llc | 11/20/1998 |
| 949 | 900 | Landline | U.s. Telepacific Corp. - Ca | 06/13/2000 |
| 949 | 939 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 09/21/2001 |
| 949 | 963 | Landline | North County Communications Corp. - Ca | 10/31/2000 |
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