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Why you should trust this guide

I research virtual phone and contact-number services the same way I would shop for one myself: by reading the published feature lists, the plan limits, and the fine print that vendors tend to bury below the marketing. Every claim in this guide is tied to what each service actually states it does, not to a wish list. When a feature only exists on a paid tier, I say so, and when a number type comes with a catch, I flag the catch instead of glossing over it.

I am not affiliated with any of these five services, and I gain nothing from steering you toward the most expensive one. My goal is to match the right tool to the right person, because a free forwarding number and an AI-equipped business line solve very different problems. Where a product has a genuine weakness, you will read about it in that product’s own section rather than in a vague disclaimer at the bottom.

How we researched

We evaluated each service against the criteria that matter for a contact or virtual number: how you get the number, whether calls and texts reach your existing phone, the quality and accuracy of voicemail handling, and how much setup stands between you and a working line. We also looked at who each service is built for, since a solo freelancer and a five-person sales team weigh features very differently. For each one we read the stated capabilities, the plan structure, and the documented limitations.

We did not run a physical lab or place test calls on every network, so we treat each vendor’s described features as its stated specs rather than as numbers we personally measured. What we can do honestly is compare those stated features side by side, point out where one service covers a gap another leaves open, and note the trade-offs that come with each approach. The result is a use-case ranking, not a single winner that pretends to suit everyone.

Google Voice — Best Free Option

Google Voice is the best choice if you want a legitimate US phone number without paying anything. The free personal plan gives you a single number that forwards both calls and texts to the phone you already carry, so you can hand out a separate line for marketplace listings, side projects, or sign-ups without exposing your primary number. Call quality is reliable over Wi-Fi and LTE, which makes it practical as a real working line rather than a novelty.

The voicemail experience is where Google Voice quietly shines. Transcription is automatic, and it is accurate enough that you can read most messages at a glance instead of dialing in to listen. If you need team features later, the Google Workspace versions layer on shared numbers and admin controls, so the service scales with you up to a point. For one person, though, the free tier covers the essentials cleanly.

The honest trade-off is acceptance. Google Voice numbers are not always recognized by business or banking platforms during verification, so if you plan to use the number to register accounts, expect some services to reject it. That single limitation is the reason I would not recommend it as the backbone of a company, even though it is excellent as a free personal line.

OpenPhone — Best for Small Business

OpenPhone is the strongest pick for a small business that needs a shared team number without inheriting a legacy phone system. It is built around the idea that several people can answer the same line, so calls stay covered even when one team member is out or away from their desk. Business-hours settings and call routing come standard, which means after-hours callers are handled the way you decide rather than ringing into the void.

Setup is refreshingly quick. The app is clean, and you can have a working number in under ten minutes, which matters when you would rather be running the business than configuring telephony. The integrations are the other big draw: connecting to Slack, HubSpot, and Zapier lets calls and texts flow into the tools your team already lives in, so a customer conversation does not get stranded outside your workflow.

The trade-off is cost and scope. OpenPhone is a paid subscription per user, so a solo operator who just wants a single forwarding line will pay for collaboration features they may never use. It is purpose-built for teams, and that focus is exactly why a one-person setup might be better served elsewhere.

Grasshopper — Best for Entrepreneurs

Grasshopper is the service I would point a solo entrepreneur toward when the goal is sounding established without hiring anyone. It is a long-running virtual phone provider that gives you a toll-free or local number, voicemail transcription, call forwarding, and an auto-attendant greeting that answers callers professionally before routing them. The effect is a polished phone presence that makes a one-person operation feel like a proper company.

One clever detail is the extension system. You can configure extensions for different departments even when you are the only person picking up, so a caller can press one for sales and two for support and still reach you each time. The desktop and mobile apps let you manage the line from wherever you are, which suits a founder who is rarely at a single desk.

The honest limitation is that Grasshopper is a layer on top of your existing phone service rather than a full communications platform, and it leans toward presentation more than deep collaboration. There is no free tier, so you are paying for the professional polish, and teams that need shared inboxes and tight CRM integration will find it thinner than a service like OpenPhone.

Sideline — Best Second Personal Number

Sideline is the right answer when you want a second number on your own phone and have no interest in running a business system. It behaves like a genuine second line on the same device, complete with its own inbox, its own voicemail, and a distinct number that shows when you call or text. That separation keeps your personal number private while still letting you communicate normally.

The use cases are exactly the everyday ones people actually have. It works well for dating apps, marketplace listings, freelance gigs, or any situation where you want to give out a contact number without handing over your personal one. Because everything lives on the phone you already own, there is no second device to carry and no complicated migration to manage.

The trade-off is that Sideline is deliberately personal rather than professional. You will not find the team routing, shared lines, or business-grade integrations that small companies need, and it is a paid app rather than a free utility. For an individual who simply wants a clean second number, that narrow focus is a strength, but it caps how far the service can grow with you.

Dialpad — Best with AI Features

Dialpad is the pick for anyone who wants the call itself to do part of the note-taking. AI transcription runs automatically on every call, and when the call ends you get a written summary with action items flagged. For a sales team, or anyone who normally scribbles notes while talking, that turns a conversation into a record you can actually act on without rewinding your memory.

Beyond the summaries, the voice intelligence features include real-time coaching prompts and keyword tracking, which is genuinely useful for managers who want consistency across a team. The standard business-phone machinery is here too: the auto-attendant and routing features are comparable to the other dedicated business services in this guide, so you are not trading core telephony for the AI layer.

The honest caveats are accuracy and price. Automatic transcription and summaries are convenient, but they can misread names, jargon, or crosstalk, so I would treat the AI output as a strong draft rather than a flawless transcript. Dialpad also sits at the more expensive, feature-heavy end of this list, which makes it overkill for someone who only wants a simple forwarding number.

What to look for

The right contact number service depends almost entirely on who is using it and why. Before you commit, weigh these factors against your actual situation:

• Cost structure: Decide whether a free single-user line covers you or whether you need a paid plan, and check if pricing is per user, which adds up fast for teams.
• Number type: Confirm you can get the kind of number you want, whether that is a local US number, a toll-free line, or a simple second personal number.
• Forwarding and reach: Make sure calls and texts land on the device you already use, so you are not stuck checking a separate app or carrying a second phone.
• Voicemail and transcription: Automatic, readable voicemail transcription saves real time, but verify how accurate and automatic it actually is on the plan you choose.
• Team features: If more than one person answers the line, look for shared numbers, call routing, business hours, and an auto-attendant.
• Integrations: Connections to tools like Slack, HubSpot, or Zapier matter if you want calls to feed into your existing workflow instead of living in isolation.
• Verification acceptance: If you will use the number to register for business or banking services, confirm the number type is widely accepted, since some virtual numbers are rejected.
• AI extras: Automatic call summaries and coaching prompts help busy callers, but treat AI transcripts as drafts and weigh whether the added cost is worth it.

The verdict

For most individuals, Google Voice is the one I would start with, because it delivers a real US number, call and text forwarding, and automatic voicemail transcription for free, with the single caveat that some business platforms will not accept the number for verification. It is the cleanest free option here.

If you are running a small team, OpenPhone is the better fit thanks to its shared numbers, business hours, call routing, and Slack, HubSpot, and Zapier integrations, all set up in minutes. Solo entrepreneurs who want to sound established should look at Grasshopper for its auto-attendant and extension system. For a private second line on your own phone, Sideline does exactly that and nothing more, which is the point. And if you want the call to summarize itself, Dialpad’s automatic transcription and action-item summaries lead the pack, as long as you accept the higher cost and treat the AI output as a first draft.