If your small business is still paying for a traditional landline phone system — or if you’re setting up phone service for the first time — you’re probably looking at VoIP. VoIP (Voice over Internet Protocol) routes calls over your internet connection rather than a traditional phone line. It’s cheaper, more flexible, and usually comes with features (auto-attendant, call routing, voicemail-to-email) that traditional phone systems charge extra for.

Here’s what you need to know to pick the right system without getting lost in the technical weeds.

Why most small businesses should use VoIP

The cost difference alone is the main reason. A traditional business phone line with basic features can cost $40–100 per line per month. A VoIP line with full features typically costs $15–30 per user per month, and setup usually requires no hardware beyond the internet connection you already have.

Beyond cost, VoIP phones work on any device — your desk phone, your laptop, your mobile phone. An employee working from home takes calls on their mobile using the business number. An employee traveling uses the app on their laptop. You’re not tied to a physical desk or office location.

The main requirement: a reliable internet connection. VoIP call quality depends on your internet speed and stability. For a small office, any business-grade internet connection (15+ Mbps up/down) is sufficient for up to 10–15 concurrent calls.

What features actually matter for small businesses

Most VoIP systems come with more features than you’ll ever use. The ones that most small businesses actually need:

Auto-attendant (“press 1 for sales, press 2 for support”): Lets callers reach the right person without a human receptionist. Even simple auto-attendants route calls effectively for small offices.

Call forwarding and routing: Forward calls to mobile phones, set business hours so after-hours calls go to voicemail, and route specific numbers to specific people.

Voicemail-to-email: Voicemails are transcribed and emailed to you. You can read a voicemail as easily as reading an email, which is a significant quality-of-life improvement.

Mobile app: Every employee can use the business phone number on their personal mobile. Callers see the business number, not the employee’s personal number.

Conference calling: For most small businesses, a bridge line for team calls or client calls. Look for one that doesn’t require calling in codes — modern VoIP systems handle this cleanly.

Number porting: Can you bring your existing business phone number to the new system? You almost certainly want to — answer yes before committing.

VoIP options for small businesses

RingCentral: The full-featured option. Everything you’d need, strong mobile apps, integrations with CRMs and Microsoft/Google tools, reliable call quality. Starts around $20-30/user/month. More features than most small businesses use, but solid.

Nextiva: Strong alternative to RingCentral with competitive pricing and good customer support. Particularly good if you want a phone provider with live support rather than just an app and documentation.

Dialpad: Modern VoIP with built-in AI features — automatic call transcription, voicemail transcription, and meeting notes. Starts around $15/user/month. A good option if you want smart features without paying for a full enterprise setup.

Google Voice for Business (Google Workspace add-on): If your business already uses Google Workspace, Voice integrates directly. It’s simpler than the others — fewer features but clean and reliable. Around $10/user/month added to your Google Workspace plan.

Grasshopper: Designed specifically for very small businesses and solopreneurs. One flat monthly fee covers a business phone number that forwards to your mobile or a team’s mobiles. No per-user fees, no complex admin. Starts around $28/month for the whole account. Not as feature-rich but the simplest option if you just want “a business number that rings my phone.”

What to check before buying

Number porting: Ask specifically whether your existing number can be ported. Most reputable providers do this at no charge, but the porting process takes 2–4 weeks.

Call quality: The best test is a free trial. Call your own mobile, your clients, and in different locations (from home, from a coffee shop). VoIP quality varies by provider and by your internet connection.

Hardware requirements: Some providers require specific VoIP desk phones; others work entirely through apps. If your team is remote or mobile-first, app-based is simpler. If you prefer desk phones in an office, confirm the phones are included, discounted, or compatible.

Contract length: Many VoIP providers want annual contracts. Some offer month-to-month at a slight premium. For a new system you haven’t tested in production, month-to-month is worth paying extra for during the first few months.

Customer support hours: When your phones stop working during a busy business day, you want to reach a human. Check support hours and channels (phone, chat, email) before buying.

A simple decision for most small businesses

If you have fewer than 10 employees and want simplicity: Grasshopper (if you’re solo or 2–3 people) or Google Voice (if you’re on Google Workspace).

If you have 5–25 employees and want a full-featured system: Dialpad or Nextiva.

If you have specific integration requirements (connecting your CRM to your phone, call analytics, compliance recording): RingCentral.

Switching phone systems is less disruptive than it used to be because everything runs through software. Most of the setup happens in a web portal, porting your number takes a few weeks, and the physical work is minimal. The payoff — lower monthly cost, better features, and phones that work wherever your team works — is worth the afternoon it takes to set up.