Local Calling Guide
Area code/prefix search
NPA: 406
[Rate centres in NPA 406]
[Dial plan for NPA 406]
<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 >>
| NPA-NXX |
BLOCK |
Rate Centre |
Region |
Switch |
OCN |
LATA |
LIR |
Eff date |
Disc date |
| 406-318
| 0 |
Billings |
MT |
|
145J TERRA NOVA TELECOM INC. |
650 |
|
2025-09-09 |
|
| 406-318
| 2 |
Billings |
MT |
BLNGMTWE9MD |
073H TELNYX LLC |
650 |
|
2023-01-09 |
|
| 406-318
| 3 |
Billings |
MT |
|
994E BANDWIDTH.COM CLEC, LLC - MT |
650 |
|
2026-05-09 |
|
| 406-318
| 4 |
Billings |
MT |
BLNGMTMAXMD |
6529 T-MOBILE USA, INC. |
650 |
|
2024-10-11 |
|
| 406-318
| 5 |
Billings |
MT |
BLNGMTMALMD |
994E BANDWIDTH.COM CLEC, LLC - MT |
650 |
|
2015-01-04 |
|
| 406-318
| 6 |
Billings |
MT |
BLNGMTMALMD |
994E BANDWIDTH.COM CLEC, LLC - MT |
650 |
|
2015-01-04 |
|
| 406-318
| 7 |
Billings |
MT |
BLNGMTMALMD |
994E BANDWIDTH.COM CLEC, LLC - MT |
650 |
|
2015-01-04 |
|
| 406-318
| 8 |
Billings |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2015-12-10 |
|
| 406-318
| 9 |
Billings |
MT |
BLNGMTMALMD |
994E BANDWIDTH.COM CLEC, LLC - MT |
650 |
|
2015-06-29 |
|
| 406-319
| A |
Polson |
MT |
MSSLMTEH4MD |
792K CHARTER IP ENABLED SERVICES, LLC |
648 |
|
|
|
| 406-319
| 0 |
Polson |
MT |
MSSLMTMACMD |
6529 T-MOBILE USA, INC. |
648 |
|
2023-12-16 |
|
| 406-319
| 1 |
Polson |
MT |
GRFLMTMAHMD |
073H TELNYX LLC |
648 |
|
2020-08-13 |
|
| 406-319
| 2 |
Polson |
MT |
MSSLMTEH4MD |
792K CHARTER IP ENABLED SERVICES, LLC |
648 |
|
2006-04-17 |
|
| 406-319
| 3 |
Polson |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2021-03-07 |
|
| 406-319
| 4 |
Polson |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2019-09-15 |
|
| 406-319
| 5 |
Polson |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2021-03-07 |
|
| 406-319
| 6 |
Polson |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2007-03-08 |
|
| 406-319
| 8 |
Polson |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2021-07-05 |
|
| 406-319
| 9 |
Polson |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2021-07-05 |
|
| 406-320
| A |
Roundup |
MT |
BLNGMTWEIMD |
6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
650 |
|
|
|
| 406-320
| 0 |
Roundup |
MT |
BLNGMTWEIMD |
6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
650 |
|
|
|
| 406-320
| 1 |
Roundup |
MT |
BLNGMTWEIMD |
6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
650 |
|
|
|
| 406-320
| 2 |
Roundup |
MT |
BLNGMTWEIMD |
6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
650 |
|
|
|
| 406-320
| 3 |
Roundup |
MT |
BLNGMTWE6MD |
9415 LEVEL 3 COMMUNICATIONS, LLC - MT |
650 |
|
2019-10-10 |
|
| 406-321
| A |
Columbus |
MT |
BLNGMTMAMMD |
6010 NEW CINGULAR WIRELESS PCS, LLC |
650 |
|
|
|
| 406-321
| 0 |
Columbus |
MT |
BLNGMTMAMMD |
6010 NEW CINGULAR WIRELESS PCS, LLC |
650 |
|
|
|
| 406-321
| 1 |
Columbus |
MT |
BLNGMTMAMMD |
6010 NEW CINGULAR WIRELESS PCS, LLC |
650 |
|
|
|
| 406-321
| 2 |
Columbus |
MT |
BLNGMTMAMMD |
6010 NEW CINGULAR WIRELESS PCS, LLC |
650 |
|
|
|
| 406-321
| 3 |
Columbus |
MT |
BLNGMTMAMMD |
6010 NEW CINGULAR WIRELESS PCS, LLC |
650 |
|
|
|
| 406-321
| 4 |
Columbus |
MT |
BLNGMTMAMMD |
6010 NEW CINGULAR WIRELESS PCS, LLC |
650 |
|
|
|
| 406-321
| 5 |
Columbus |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2021-02-11 |
|
| 406-321
| 6 |
Columbus |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2021-02-11 |
|
| 406-321
| 7 |
Columbus |
MT |
|
145J TERRA NOVA TELECOM INC. |
650 |
|
2021-09-28 |
|
| 406-321
| 8 |
Columbus |
MT |
BLNGMT93DS0 |
588H AIRUS, INC. - MT |
650 |
|
2020-07-20 |
|
| 406-321
| 9 |
Columbus |
MT |
BLNGMTMAMMD |
6010 NEW CINGULAR WIRELESS PCS, LLC |
650 |
|
|
|
| 406-322
| A |
Columbus |
MT |
CLMBMTMARS1 |
9636 QWEST CORPORATION |
650 |
|
|
|
| 406-322
| 0 |
Columbus |
MT |
CLMBMTMARS1 |
9636 QWEST CORPORATION |
650 |
|
|
|
| 406-322
| 1 |
Columbus |
MT |
CLMBMTMARS1 |
9636 QWEST CORPORATION |
650 |
|
|
|
| 406-322
| 2 |
Columbus |
MT |
BLNGMTWE6MD |
9415 LEVEL 3 COMMUNICATIONS, LLC - MT |
650 |
|
2004-11-13 |
|
| 406-322
| 3 |
Columbus |
MT |
BLNGMTWE6MD |
9415 LEVEL 3 COMMUNICATIONS, LLC - MT |
650 |
|
2006-01-06 |
|
| 406-322
| 4 |
Columbus |
MT |
CLMBMTMARS1 |
9636 QWEST CORPORATION |
650 |
|
|
|
| 406-322
| 5 |
Columbus |
MT |
CLMBMTMARS1 |
9636 QWEST CORPORATION |
650 |
|
|
|
| 406-322
| 6 |
Columbus |
MT |
CLMBMTMARS1 |
9636 QWEST CORPORATION |
650 |
|
|
|
| 406-322
| 7 |
Columbus |
MT |
BLNGMT934MD |
939H COMMIO, LLC |
650 |
|
2024-03-04 |
|
| 406-322
| 8 |
Columbus |
MT |
CLMBMTMARS1 |
9636 QWEST CORPORATION |
650 |
|
|
|
| 406-322
| 9 |
Columbus |
MT |
CLMBMTMARS1 |
9636 QWEST CORPORATION |
650 |
|
|
|
| 406-323
| A |
Roundup |
MT |
RNDPMTXCDS0 |
2246 MID-RIVERS TEL. COOP., INC. |
650 |
|
|
|
| 406-323
| 1 |
Roundup |
MT |
RNDPMTXCDS0 |
2246 MID-RIVERS TEL. COOP., INC. |
650 |
|
|
|
| 406-323
| 2 |
Roundup |
MT |
RNDPMTXCDS0 |
2246 MID-RIVERS TEL. COOP., INC. |
650 |
|
|
|
| 406-323
| 3 |
Roundup |
MT |
RNDPMTXCDS0 |
2246 MID-RIVERS TEL. COOP., INC. |
650 |
|
|
|
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Last updated: Sun, 17 May 2026 03:26:51 UTC
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