Area code 406

Get a local Montana phone number

Looking to expand into Montana? Start by getting a local phone number in the 406 area code from Sideline. The Sideline app conveniently adds a second number to your phone, and our patented technology provides reliable, carrier-level call quality and texting.

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406 area code

Why choose Sideline for your 406 phone number?

Establish a local presence quickly and easily

There’s no need for a second phone when you’ve got Sideline. Just download the app to add a second number to the phone you already have, and connect with the local community.

Keep your communication separate and organized

Sideline helps you keep work separate from your personal life with a dedicated second number, a custom voicemail, personalized ringtones, and a Sideline-specific contacts list.

Identify callers and reduce spam

You’ll always know who’s calling with Sideline’s advanced Caller ID, and Spam Filtering automatically detects spam calls and sends them straight to voicemail for your review.

Access your second number from any device

Whether you’re on the go or working from home, your Sideline number is always there for you. Use the mobile app on your phone and tablet, or access Sideline on the web.

How do I get a 406 phone number with Sideline?

Choose a local number
Select a monthly or yearly plan^*
Start sharing your new phone number!

Sideline is more than just a second number

Superior Call Quality

Sideline uses your carrier’s network for top-tier call quality.

No WiFi Needed

Unlike VoIP services, Sideline gives you the freedom to leave your WiFi network.

Avoid Spam

We detect spam calls, telemarketers, and potential fraud so you can easily avoid them.

Auto-Reply

Send an automated text reply to any missed calls or messages.

Separate Voicemail

Record your Sideline greeting so people can leave a message after the beep.

Unlimited Messaging

Send unlimited SMS, MMS, and group messages.

Number Porting

Already have a second number? Bring it to Sideline from another device or landline.

Ring & Text Tones

Differentiate between numbers with unique ring and text tones.

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^*Plans start at $14.49/mo

About the 406 Area Code

FAQs about the 406 area code

Is 406 a toll-free area code?

No. 406 is a geographic area code for Montana and standard calling rates apply based on your plan.

What time is it in the 406 area code?

Numbers in 406 follow Mountain Time (MT). Daylight saving time may apply depending on the date.

Do I have to dial the area code for local calls in 406?

Yes. Since October 24, 2021, local calls within 406 require 10-digit dialing due to the nationwide 988 lifeline.

Which states or cities use the 406 area code?

The 406 area code covers the entire state of Montana, including Billings, Missoula, Great Falls, Bozeman, and Helena.

Can I keep my 406 number if I move or switch services?

In most cases, yesﾑnumber portability lets you keep your existing 406 number. You can also port a current 406 to Sideline when available.

Get started with Sideline today.

Start your free 7-day trial on iOS or Android.