For startups & small businesses

The modern phone system for small businesses.

Get a local or toll-free number with greetings, extensions, and calls that reach your mobile, your team, or a connected AI agent. Manage business texts and WhatsApp in one inbox, with notifications in Slack.

No per-user fees!

  • Money-back guarantee
  • No long-term contracts
  • Free support
Works with Your mobile WhatsApp Slack
From the team featured in
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Sound professional & stay connected.

Callers hear your main greeting and are forwarded anywhere you and your team work from, including AI agents.

Learn how call forwarding and AI agent connections work.

Set up your phone system in minutes.

  1. 1

    Get your number

    Choose a local or toll-free number, or bring your existing business number.

  2. 2

    Decide where calls go

    Set up your greeting, phone menu, extensions, business hours, and routing.

  3. 3

    Add your team

    Route calls to the phones they already have. Add everyone who needs access without paying for another seat.

  4. 4

    Add AI when you want it

    Send an extension or a call-routing destination to an AI agent for sales, intake, support, or after-hours calls.

See each step on the How it works page.

Call & text customers from your business number.

Use the Numberline app on the mobile you already carry. Customers see the business number, and your personal number stays private.

Keep work calls separate with a second phone number for your business.

Calling…
NC
New customer
(646) 555-0117
You're calling from
Your mobile
Customer sees
Your Business(212) 555-5225

Texts & WhatsApp in one inbox. Call & voicemail alerts in Slack.

Anyone with access to the business number can read and reply. Slack tells your team when someone calls, texts, or leaves a voicemail.

How business texting works →

How WhatsApp works →

How Slack notifications work →

Add your whole team with no per‑user fees.

Numberline includes unlimited users. Give everyone who answers calls or texts their own access.

Everything your business phone needs.

Phone menus, call routing, AI agents, and integrations.

Phone menus & extensions

Send callers to Sales, Support, Billing, a person, or an AI agent.

Call forwarding

Ring phones together or one after another, with business hours set on the number.

Connect AI agents

Connect an agent from your AI provider for sales, intake, support, or after-hours calls.

Integrations

Connect Slack, WhatsApp, and your other tools through integrations and webhooks.

See every feature on the How it works page.

Simple pricing for small businesses.

Compare prices on the pricing page.

Unlimited users

Your price stays the same as your team grows.

No long-term contracts

Keep Numberline for as long as it works for your business.

Free support

A real person helps you until the issue is resolved.

Built to keep your business connected.

99.5%Uptime target*
Independent call routingCalls keep forwarding if the app is unavailable.
Real human supportSomeone owns your issue through resolution.

Read our reliability commitment.

*Terms defined in our service-level agreement.

Frequently asked questions

What is Numberline?
Numberline is a phone system for small businesses. You get a local or toll-free business number with calls, texts, phone menus, extensions, and voicemail.
Do I need a new phone or SIM?
You keep the phones you have. Calls forward to your team’s mobiles, and the Numberline app on iPhone or Android calls and texts from the business number.
Can I keep my existing number?
Yes, you can port an eligible number to Numberline. Keep your current service active until the port completes, since your current carrier sets the timeline (see how porting works).
Can my whole team use it?
Yes. Numberline includes unlimited users, so everyone who answers calls or texts gets their own access with no per-user fees.
What happens to unanswered calls?
Unanswered calls go to your business voicemail with your business greeting. Each message is recorded, transcribed, summarized, and emailed to you.
Can I connect an AI agent?
Yes. Connect your AI provider, choose an agent, and decide which calls it answers, such as sales, customer intake, or after-hours calls.

Get your business phone system.

Calls, texts, and voicemail for your team.

Get early access
No per-user fees No long-term contracts Money-back guarantee