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 |
| 406-709
| 1 |
Lakeside |
MT |
|
145J TERRA NOVA TELECOM INC. |
648 |
|
2025-10-11 |
|
| 406-709
| 2 |
Lakeside |
MT |
KLSLMTAZ1MD |
792K CHARTER IP ENABLED SERVICES, LLC |
648 |
|
|
|
| 406-709
| 3 |
Lakeside |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2012-12-14 |
|
| 406-709
| 4 |
Lakeside |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2012-12-14 |
|
| 406-709
| 5 |
Lakeside |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2012-12-14 |
|
| 406-709
| 6 |
Lakeside |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2019-09-15 |
|
| 406-709
| 7 |
Lakeside |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2007-11-17 |
|
| 406-709
| 8 |
Lakeside |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2011-05-14 |
|
| 406-709
| 9 |
Lakeside |
MT |
GRFLMTMAHMD |
073H TELNYX LLC |
648 |
|
2020-08-13 |
|
| 406-717
| A |
Billings |
MT |
BLNGMT937MD |
197D VONAGE AMERICA LLC |
650 |
|
|
|
| 406-717
| 0 |
Billings |
MT |
BLNGMT937MD |
197D VONAGE AMERICA LLC |
650 |
|
2018-07-30 |
|
| 406-717
| 1 |
Billings |
MT |
BLNGMTWEDMD |
624H ONVOY SPECTRUM, LLC |
650 |
|
2022-11-12 |
|
| 406-717
| 2 |
Billings |
MT |
BLNGMTWEDMD |
624H ONVOY SPECTRUM, LLC |
650 |
|
2022-11-12 |
|
| 406-717
| 3 |
Billings |
MT |
BLNGMTWEDMD |
624H ONVOY SPECTRUM, LLC |
650 |
|
2022-11-12 |
|
| 406-717
| 4 |
Billings |
MT |
BLNGMTMAXMD |
6529 T-MOBILE USA, INC. |
650 |
|
2022-01-14 |
|
| 406-717
| 5 |
Billings |
MT |
BLNGMTMAXMD |
6529 T-MOBILE USA, INC. |
650 |
|
2022-01-14 |
|
| 406-717
| 6 |
Billings |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2020-04-04 |
|
| 406-717
| 7 |
Billings |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2020-04-04 |
|
| 406-717
| 8 |
Billings |
MT |
BLNGMTMAXMD |
6529 T-MOBILE USA, INC. |
650 |
|
2021-03-12 |
|
| 406-717
| 9 |
Billings |
MT |
BLNGMTMAXMD |
6529 T-MOBILE USA, INC. |
650 |
|
2021-03-12 |
|
| 406-718
| A |
Darby |
MT |
GRFLMTMAPMD |
506J TWILIO INTERNATIONAL, INC. |
648 |
|
|
|
| 406-718
| 1 |
Darby |
MT |
MSSLMTEH4MD |
792K CHARTER IP ENABLED SERVICES, LLC |
648 |
|
2024-09-08 |
|
| 406-718
| 4 |
Darby |
MT |
GRFLMTMAPMD |
506J TWILIO INTERNATIONAL, INC. |
648 |
|
2022-08-28 |
|
| 406-718
| 7 |
Darby |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2021-06-11 |
|
| 406-718
| 8 |
Darby |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2021-06-11 |
|
| 406-719
| A |
Fromberg |
MT |
BLNGMTASMMD |
506J TWILIO INTERNATIONAL, INC. |
650 |
|
|
|
| 406-719
| 0 |
Fromberg |
MT |
BLNGMT933MD |
073H TELNYX LLC |
650 |
|
2019-10-21 |
|
| 406-719
| 1 |
Fromberg |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2020-01-05 |
|
| 406-719
| 2 |
Fromberg |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2020-11-10 |
|
| 406-719
| 3 |
Fromberg |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2021-02-11 |
|
| 406-719
| 4 |
Fromberg |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2019-10-20 |
|
| 406-719
| 5 |
Fromberg |
MT |
BLNGMTASMMD |
506J TWILIO INTERNATIONAL, INC. |
650 |
|
2022-08-28 |
|
| 406-719
| 6 |
Fromberg |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2019-10-20 |
|
| 406-719
| 7 |
Fromberg |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2020-01-05 |
|
| 406-719
| 8 |
Fromberg |
MT |
BLNGMT93BMD |
321J HD CARRIER LLC |
650 |
|
2020-09-27 |
|
| 406-719
| 9 |
Fromberg |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2021-02-11 |
|
| 406-720
| A |
Colstrip |
MT |
BLNGMTWEIMD |
6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
650 |
|
|
|
| 406-720
| 0 |
Colstrip |
MT |
BLNGMTWEIMD |
6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
650 |
|
|
|
| 406-720
| 1 |
Colstrip |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2021-07-05 |
|
| 406-720
| 2 |
Colstrip |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2019-09-15 |
|
| 406-720
| 3 |
Colstrip |
MT |
BLNGMTWEIMD |
6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
650 |
|
2012-09-10 |
|
| 406-720
| 4 |
Colstrip |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2019-09-15 |
|
| 406-720
| 5 |
Colstrip |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2012-12-17 |
|
| 406-720
| 6 |
Colstrip |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2012-12-17 |
|
| 406-720
| 7 |
Colstrip |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2012-12-17 |
|
| 406-720
| 8 |
Colstrip |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2012-12-17 |
|
| 406-720
| 9 |
Colstrip |
MT |
BLNGMT933MD |
073H TELNYX LLC |
650 |
|
2018-07-25 |
|
| 406-721
| A |
Missoula |
MT |
MSSLMTMADS0 |
9636 QWEST CORPORATION |
648 |
|
|
|
| 406-722
| A |
Alberton |
MT |
ALTNMTXBRS1 |
2235 BLACKFOOT TEL. COOP., INC. |
648 |
|
|
|
| 406-722
| 0 |
Alberton |
MT |
|
2235 BLACKFOOT TEL. COOP., INC. |
648 |
|
|
|
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Last updated: Sun, 17 May 2026 03:26:51 UTC
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