406 Area Code — MT
Area code 406 serves MT in the Mountain time zone, in service since 1947. The FCC has 74 unwanted-call complaints against 73 different 406 numbers on record. Look up the exact number that called you below.
Most-reported 406 numbers
Ranked by FCC unwanted-call complaints. Click a number for its full report.
406 unwanted-call complaints, last 12 months
Monthly FCC complaint volume against 406 numbers. Spikes usually mark an active robocall campaign cycling through the code.
About area code 406
- Serves
- MT
- Time zone
- Mountain
- In service since
- 1947-01-01
- Overlay
- No
Source: NANPA numbering records, refreshed weekly.
Spam calls from 406? What to know
Seeing repeated missed calls from 406 numbers you don't recognize is the classic signature of neighbor-spoofing robocall campaigns. The caller isn't necessarily in MT — spoofing software displays whatever digits the campaign chooses. Never call unknown numbers back; look them up first, and report unwanted calls to the FCC to build the public record.
Area code 406 FAQs
Where is area code 406?
Area code 406 serves MT, in the Mountain time zone. It has been in service since 1947.
Why do I keep getting calls from 406 numbers?
Robocallers use "neighbor spoofing" — displaying a number with a local area code to make you more likely to answer. A call showing area code 406 may not originate from MT at all. Look up the full 10-digit number on this site to see its complaint history before calling back.
Are 406 numbers safe to call back?
Area codes themselves are neither safe nor unsafe — 406 contains millions of legitimate lines alongside any spoofed or spam numbers. The FCC has logged 74 unwanted-call complaints against 73 distinct 406 numbers in our current data window. Check the specific number's report page before returning a missed call.