Area code 406 is assigned for use in Montana since Jan 01, 1947. View all phone prefixes used in area code 406 or other area codes in Montana. Included with the location of each prefix are the phone companies / service providers that operates them.
| Area code / prefix | Location | Company / Service Provider |
|---|---|---|
| 406-200 | BILLINGS, MT | TELEPORT COMMUNICATIONS AMERICA MT - LLC |
| 406-201 | FORSYTH, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-202 | HELENA, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-203 | MISSOULA, MT | LEVEL 3 COMMUNICATIONS, LLC - MT |
| 406-204 | HELENA, MT | LEVEL 3 COMMUNICATIONS, LLC - MT |
| 406-205 | Great Falls, MT | LEVEL 3 COMMUNICATIONS, LLC - MT |
| 406-206 | BILLINGS, MT | LEVEL 3 COMMUNICATIONS, LLC - MT |
| 406-207 | MISSOULA, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-208 | BILLINGS, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-209 | BOZEMAN, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-210 | SEELEYLAKE, MT | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
| 406-212 | KALISPELL, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-213 | COLSTRIP, MT | LEVEL 3 COMMUNICATIONS, LLC - MT |
| 406-214 | MISSOULA, MT | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
| 406-215 | MISSOULA, MT | SKYE TELECOM LLC DBA SKYETEL |
| 406-216 | Great Falls, MT | 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT |
| 406-217 | Great Falls, MT | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
| 406-218 | MISSOULA, MT | T-MOBILE USA, INC. |
| 406-219 | BOZEMAN, MT | AT&T - LOCAL |
| 406-220 | LIVINGSTON, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-221 | BUTTE, MT | AT&T - LOCAL |
| 406-222 | LIVINGSTON, MT | QWEST CORPORATION |
| 406-223 | LIVINGSTON, MT | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
| 406-224 | LIVINGSTON, MT | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
| 406-225 | BOULDER, MT | QWEST CORPORATION |
| 406-226 | EGLACIERPK, MT | QWEST CORPORATION |
| 406-227 | HELENA, MT | QWEST CORPORATION |
| 406-228 | GLASGOW, MT | NEMONT TEL COOP INC |
| 406-229 | CUT BANK, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-230 | GLASGOW, MT | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
| 406-231 | Great Falls, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-232 | MILES CITY, MT | QWEST CORPORATION |
| 406-233 | MILES CITY, MT | QWEST CORPORATION |
| 406-234 | MILES CITY, MT | MID-RIVERS TELEPHONE COOPERATIVE, INC. |
| 406-235 | WOLF CREEK, MT | QWEST CORPORATION |
| 406-236 | NEIHART, MT | 3 RIVERS TEL. COOP., INC. |
| 406-237 | BILLINGS, MT | QWEST CORPORATION |
| 406-238 | BILLINGS, MT | QWEST CORPORATION |
| 406-239 | MISSOULA, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-240 | MISSOULA, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-241 | MISSOULA, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-242 | THOMPSNFLS, MT | NEW CINGULAR WIRELESS PCS, LLC |
| 406-243 | MISSOULA, MT | QWEST CORPORATION |
| 406-244 | POTOMAC, MT | BLACKFOOT TEL. COOP., INC. |
| 406-245 | BILLINGS, MT | QWEST CORPORATION |
| 406-246 | DIXON, MT | BLACKFOOT TEL. COOP., INC. |
| 406-247 | BILLINGS, MT | QWEST CORPORATION |
| 406-248 | BILLINGS, MT | QWEST CORPORATION |
| 406-249 | KALISPELL, MT | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
| 406-250 | KALISPELL, MT | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
| 406 Area Code Information | ||
|---|---|---|
| Type of code: | General Purpose Code | |
| Location: | MT - US | |
| Time zone: | M | |
| Assigned for use: | Yes | |
| Code in service: | Yes | |
| Service date: | 01/01/47 | |
| In jeopardy: | No | |
| Relief in progress: | No | |
| NPA Relief status: | ||
| Code assignable: | Yes | |
| Geographic or non-geographic: |
G | |
| Reserved for future use: | No | |
| Planning letter(s): | 556 544 | |
| Overlay code: | No | |
| Overlay complex: | ||
| Dialing plan | Standard | Permissive |
| Home local calls: | 10D | 1+10D |
| Foreign local calls: | 10D | 1+10D |
| Home toll calls: | 1+10D | NA |
| Foreign toll calls: | 1+10D | - |
1+10 digit permissible at service provider discretion.