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The city of Montebello is in the state of California. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 323 | 213 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 11/21/2006 |
| 323 | 215 | Landline | Xo California, Inc. | 07/22/1999 |
| 323 | 216 | Wireless | Sprint Spectrum L.p. | 12/26/2001 |
| 323 | 246 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 08/13/2006 |
| 323 | 248 | Landline | Pacific Bell | 06/07/2010 |
| 323 | 253 | Wireless | Sprint Spectrum L.p. | 07/22/1999 |
| 323 | 270 | Wireless | Sprint Spectrum L.p. | 07/22/1999 |
| 323 | 271 | Landline | Pacific Bell | 07/22/1999 |
| 323 | 273 | Wireless | Sprint Spectrum L.p. | 07/22/1999 |
| 323 | 278 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 281 | Wireless | 33 Wireless Inc. | 07/22/1999 |
| 323 | 303 | Landline | Level 3 Communications, Llc - Ca | 11/28/2006 |
| 323 | 314 | Wireless | New Cingular Wireless Pcs, Llc | 10/13/1999 |
| 323 | 324 | Wireless | American Messaging Services, Llc | 01/14/2000 |
| 323 | 346 | Landline | Mpower Communications Corp - Ca | 10/13/1999 |
| 323 | 353 | Wireless | Sprint Spectrum L.p. | 03/03/2001 |
| 323 | 358 | Wireless | Sprint Spectrum L.p. | 12/23/2011 |
| 323 | 359 | Wireless | Sprint Spectrum L.p. | 06/13/2000 |
| 323 | 365 | Wireless | New Cingular Wireless Pcs, Llc | 06/13/2000 |
| 323 | 385 | Wireless | Sprint Spectrum L.p. | 06/13/2000 |
| 323 | 399 | Wireless | Sprint Spectrum L.p. | 02/13/2007 |
| 323 | 427 | Wireless | Metropcs Networks, Llc | 04/22/2011 |
| 323 | 434 | Wireless | New Cingular Wireless Pcs, Llc | 03/28/2007 |
| 323 | 437 | Wireless | Sprint Spectrum L.p. | 11/21/2012 |
| 323 | 439 | Wireless | Sprint Spectrum L.p. | 04/04/2007 |
| 323 | 440 | Wireless | New Cingular Wireless Pcs, Llc | 06/30/2001 |
| 323 | 453 | Wireless | Sprint Spectrum L.p. | 01/14/2013 |
| 323 | 477 | Wireless | Sprint Spectrum L.p. | 07/13/2012 |
| 323 | 479 | Wireless | Sprint Spectrum L.p. | 06/07/2007 |
| 323 | 482 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 10/11/2005 |
| 323 | 483 | Wireless | Sprint Spectrum L.p. | 10/01/2012 |
| 323 | 485 | Landline | Broadwing Communications, Llc - Ca | 03/08/2006 |
| 323 | 494 | Wireless | Sprint Spectrum L.p. | 06/07/2007 |
| 323 | 501 | Wireless | Sprint Spectrum L.p. | 06/07/2007 |
| 323 | 506 | Wireless | Sprint Spectrum L.p. | 06/07/2007 |
| 323 | 514 | Wireless | Sprint Spectrum L.p. | 04/23/2001 |
| 323 | 516 | Landline | Cellco Partnership Dba Verizon Wireless - Ca | 06/13/2000 |
| 323 | 519 | Wireless | T-mobile Usa, Inc. | 07/03/2007 |
| 323 | 530 | Wireless | T-mobile Usa, Inc. | 07/22/2016 |
| 323 | 548 | Wireless | Sprint Spectrum L.p. | 09/22/2014 |
| 323 | 594 | Wireless | New Cingular Wireless Pcs, Llc | 08/29/2007 |
| 323 | 597 | Wireless | T-mobile Usa, Inc. | 10/17/2014 |
| 323 | 598 | Wireless | Sprint Spectrum L.p. | 11/24/2014 |
| 323 | 614 | Wireless | Sprint Spectrum L.p. | 09/24/2007 |
| 323 | 622 | Landline | Allegiance Telecom, Inc. - Ca | 06/13/2000 |
| 323 | 624 | Landline | North County Communications Corp. - Ca | 08/20/2000 |
| 323 | 626 | Landline | North County Communications Corp. - Ca | 01/14/2000 |
| 323 | 629 | Wireless | Sprint Spectrum L.p. | 09/24/2007 |
| 323 | 631 | Wireless | Sprint Spectrum L.p. | 11/04/2014 |
| 323 | 637 | Wireless | Sprint Spectrum L.p. | 11/10/2005 |
| 323 | 670 | Wireless | Sprint Spectrum L.p. | 12/22/2014 |
| 323 | 680 | Wireless | Sprint Spectrum L.p. | 09/24/2007 |
| 323 | 691 | Wireless | Sprint Spectrum L.p. | 05/10/1999 |
| 323 | 695 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 09/28/2007 |
| 323 | 697 | Wireless | New Cingular Wireless Pcs, Llc | 04/16/2001 |
| 323 | 707 | Wireless | Sprint Spectrum L.p. | 06/26/2001 |
| 323 | 712 | Wireless | T-mobile Usa, Inc. | 06/14/2002 |
| 323 | 714 | Wireless | T-mobile Usa, Inc. | 07/15/2013 |
| 323 | 715 | Landline | New Cingular Wireless Pcs, Llc | 08/22/2001 |
| 323 | 718 | Wireless | Sprint Spectrum L.p. | 03/02/2006 |
| 323 | 720 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 721 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 722 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 724 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 725 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 726 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 727 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 728 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 742 | Wireless | Sprint Spectrum L.p. | 04/25/2006 |
| 323 | 787 | Wireless | Sprint Spectrum L.p. | 08/17/2006 |
| 323 | 797 | Wireless | Cellco Partnership Dba Verizon Wireless - Ca | 09/09/2014 |
| 323 | 816 | Wireless | Sprint Spectrum L.p. | 05/10/1999 |
| 323 | 827 | Wireless | Sprint Spectrum L.p. | 12/22/2014 |
| 323 | 832 | Landline | Pacific Bell | 05/10/1999 |
| 323 | 837 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 838 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 869 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 884 | Wireless | Sprint Spectrum L.p. | 10/14/2014 |
| 323 | 887 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 888 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 889 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 890 | Landline | Pacific Bell | 08/14/1998 |
| 323 | 893 | Wireless | New Cingular Wireless Pcs, Llc | 04/23/2001 |
| 323 | 895 | Wireless | New Cingular Wireless Pcs, Llc | 03/28/2008 |
| 323 | 926 | Wireless | T-mobile Usa, Inc. | 02/09/2015 |
| 323 | 947 | Landline | Pacific Bell | 08/20/2000 |
| 323 | 972 | Wireless | Sprint Spectrum L.p. | 06/13/2000 |
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