What Is VoIP? How Internet Phone Service Works

VoIP (Voice over Internet Protocol) is phone service that sends your calls over the internet instead of copper phone lines. Your voice is converted into data packets, routed across the network, and reassembled as sound on the other end, so any device with an internet connection can be your phone.

That is the whole trick. Because the call is just data, VoIP is not tied to a wall jack, a desk phone, or a physical location. Your business number can ring your cell phone in a truck, your laptop at home, and a teammate's browser in another state, all at the same time.

How VoIP works, step by step

When you speak into a VoIP app or headset, four things happen in well under a tenth of a second:

1. Conversion. A codec turns your voice into compressed digital audio. A typical business call uses roughly 85 to 100 kbps of bandwidth per direction, less than a YouTube video; how much internet speed VoIP needs breaks down the real numbers.
2. Packetizing. The audio is chopped into small packets, each stamped with an address and sequence number.
3. Routing. The packets travel over your internet connection to your provider, which hands the call to the regular phone network if the other side is a normal number.
4. Reassembly. The receiving end puts the packets back in order and plays them as sound.

The person you call notices nothing. To them, a VoIP call from your business number looks and sounds like any other call, with your caller ID attached.

VoIP vs landline at a glance

Here is the honest comparison most buyers actually want:

If you want the deeper version of this table, including the two situations where copper still wins, read our full VoIP vs landline comparison.

What VoIP gives a small business

One number, every device

The company number stops being a physical object. A modern business phone system built on VoIP lets a 4-person team share one local or toll-free number, with calls routed by simple rules: sales calls ring Maya and Tom together, support goes to whoever is on shift, after-hours callers get voicemail that arrives as readable text. A number that lives in software rather than on a line is what the industry calls a virtual phone number, and adding one to the phone you already carry takes about five minutes with no SIM swap.

Features that used to need a phone closet

An IVR phone menu ("press 1 for sales"), ring groups, business texting, call recording with a consent announcement, and voicemail transcription all run in software. Twenty years ago that feature list meant a $10,000 PBX box and a maintenance contract. Today it is a checkbox on a $29 plan.

Real cost math

A 5-person team on landlines commonly pays $200 to $350 a month for lines plus hardware amortization. The same team on a cloud system typically pays $75 to $145 a month, with more features and no equipment to break. Savings of 50 to 70 percent are common, and the setup fee is usually zero.

The downsides, stated plainly

• VoIP needs internet. No connection, no calls from that device. In practice mobile apps ride the cellular network, so a dead office router rarely means missed calls, but a location with genuinely unreliable internet is a poor fit.
• Call quality follows network quality. On a healthy connection VoIP audio is better than a landline (wider frequency range). On a congested network you can get choppiness. Wired connections and decent routers solve this for almost everyone.
• 911 works differently. Emergency services locate a VoIP call by the address you registered, not by the wire. If you move and forget to update it, responders may be sent to the old address. Every honest provider, Phoner included, states this limitation in its terms.

What to look for in a VoIP provider

Providers look similar on the pricing page. Judge them on:

• Per-user price and contract shape. $15 to $30 per user per month, month-to-month, is the fair range for small teams. Be wary of teaser rates that require 3-year terms.
• What the base plan actually includes. Unlimited US and Canada calling, voicemail-to-text, and mobile plus desktop apps should not be upsells.
• IVR and routing depth. If more than one person answers, you want a phone menu and ring groups. Check they exist and are visible in the product, not buried in an enterprise tier. Our roundup of the best second phone number apps compares the main US providers on exactly this point.
• App quality. The business phone number app on your pocket phone is where you will live. It should keep work calls clearly separated from personal ones.
• Free number porting. Your existing number should transfer at no cost, and stay live during the port.

What VoIP costs in 2026

Typical US pricing for small-business cloud phone service:

• Base seats: $15 to $35 per user per month depending on features, with yearly billing about 20 percent cheaper than monthly.
• Extra numbers: around $5 per number per month for additional local, toll-free, or vanity numbers.
• Hardware: $0 required. Optional SIP desk phones run $60 to $150 if you want them.
• Porting: free with most reputable providers.

For context, Phoner's Starter plan is $15 per user per month billed yearly and includes a local number, unlimited US and CA calling, apps for every device, and voicemail-to-text.

The bottom line

VoIP is not an exotic technology anymore; it is how most business calls are already made. If your team has a stable internet connection and anyone ever works away from a desk, VoIP is cheaper, faster to set up, and dramatically more capable than a landline. When you are ready to act on that, our guide to getting a business phone number walks through the whole setup in five steps.