"Free business phone number" actually covers two unrelated kinds of product. One kind is a genuinely $0-per-month consumer app (Google Voice's free tier, TextNow's Free plan) that you can technically use for work calls. The other is a business phone system where "free" just means a limited trial before a paid plan starts — Grasshopper and Quo offer a 7-day trial, while Sideline has no free trial at all and is paid-only from day one. Neither top-10 result for this search spells out which restrictions, retention risks, and missing features come with the first kind — this comparison does, using each provider's own current terms and pricing, dated below. Disposable or verification-bypass numbers (Hushed, Burner, temporary SMS-receive sites) are out of scope.
Two categories, not one
| Category | Examples | Ongoing cost | Built for business use? |
|---|---|---|---|
| $0 ongoing, consumer app | Google Voice (free), TextNow (Free plan) | $0/month, indefinitely | No — both state in their own terms that the free tier is for personal use |
| Carrier-based second line | Sideline | No free tier; from ~$99/year | Built for calls/texts on your carrier's minutes, not an AI/receptionist layer |
| Business VoIP system, trial only | Grasshopper, Quo (formerly OpenPhone) | 7-day free trial, then from $14–$15/user/month (annual) | Yes, but "free" ends after the trial |
| Answering layer behind a number | Beside Phone | No trial on Baseline; $29/business/month at checkout | Yes — it forwards or ports your existing number and answers calls, rather than selling a new free number |
Category 1: Genuinely $0 numbers — and what they restrict
Google Voice's free consumer tier and TextNow's $0 Free plan are the only options here that cost nothing indefinitely. Both also say, in their own documentation, that this free tier isn't meant for business use. That's a restriction to weigh before handing the number to customers, not a guarantee of how or whether it gets enforced.
| Feature | Google Voice (free/consumer) | TextNow (Free $0 plan) |
|---|---|---|
| Monthly cost | $0 | $0 |
| Business use allowed by the provider's own terms? | No — Google's Voice Help Community pages state consumer Voice is "specifically not intended to be used for business purposes" | No — TextNow's support site says commercial use of the free plan "can result in account limitations" |
| Call forwarding included free? | Yes, to up to 6 linked numbers, at no extra cost | No — forwarding requires the paid Ad-Free+ upgrade |
| Number retention risk on inactivity | — | No fixed day-count per TextNow, but inactivity risks recycling; TextNow's own help article recommends calling or texting at least once a day, or buying the paid "Lock In Number" add-on. Sister app TextFree documents a concrete 30-day inactivity window as the closest published analog |
| Legitimate paid business tier, if you outgrow free | Google Voice Personal or Google Workspace, from $10/user/month (scaling to $16–$30/user/month for Standard/Premier) | — |
The practical gap most comparisons skip: TextNow's $0 plan doesn't even forward calls anywhere without paying for Ad-Free+. If the whole point is answering calls without changing the number customers know, a free TextNow number can't do that on its own — Google Voice's free forwarding can.
Category 2: "Free" business systems that are really trial-only
Grasshopper, Quo, and Sideline are built for business use from day one — but none of them has an ongoing free tier. "Free" here means a 5-to-7-day trial clock, after which a paid plan is required to keep the number working. Sideline doesn't even offer a free trial; it runs on your phone's existing carrier minutes by default rather than VoIP, with a text auto-reply but no receptionist feature.
| Provider | Free trial | Price after trial | Notes |
|---|---|---|---|
| Grasshopper | 7 days | From $14/month (True Solo, billed annually) | Business VoIP system |
| Quo (formerly OpenPhone) | 7 days | From $15/user/month (Starter, billed annually) | Per-seat pricing |
| Sideline | None | No free tier; from roughly $99/year per its App Store listing | Carrier-minutes based by default; auto-reply texting only |
| Beside Phone — Baseline | None; billing starts at checkout | $29/business/month | 30 AI Receptionist-answered calls/month, 1 line included, extra lines $4.99/month, up to 20 seats |
| Beside Phone — Unlimited | 7 days (payment method required, trial texting capped at 15 messages) | $99/business/month | Unlimited AI Receptionist-answered calls |
One option to drop from any 2026 comparison: Skype. Microsoft fully retired Skype, including its purchasable Skype Number feature, on May 5, 2025. If an older roundup still lists it, that advice is out of date.
If the real goal is "answer calls without changing the number"
None of the free or trial-only options above add an answering layer on top of a number you already use. If your actual need is help answering calls on a number customers already know — rather than a brand-new free number — the relevant question becomes how to connect that number to an answering service, not which free number to sign up for next.
- Call forwarding: keep your current carrier and plan; calls route to Beside, which answers. Texts you send through Beside show the Beside number, and SMS two-factor codes on the original carrier line keep working.
- Porting: move the number itself into Beside. Beside documents a specific path for Google Voice numbers — unlock the number at voice.google.com, then a $3 port-out fee applies (waived if the number was originally ported into Google Voice from another carrier). Porting typically takes 1–2 weeks, and voicemail/message history does not transfer with any VoIP port.
- Beside's own guidance is that call forwarding specifically from Google Voice is "limited support... may be unreliable" and won't forward texts, so Beside recommends porting over forwarding for Google Voice numbers.
- Sideline numbers port out for a $19.99 fee. TextNow isn't named in Beside's provider-specific porting guide — only Google Voice, Sideline, Grasshopper, and GoDaddy Conversations are listed by name, alongside a generic "Other VoIP" path. Treat a TextNow-to-Beside move as untested rather than a confirmed integration.
Which path fits your situation
- Low call volume, no complaints, mainly want separation from your personal cell: a free Google Voice or TextNow number may be enough for now — see our guide on choosing a second number for business for that decision specifically.
- You're already paying for Google Voice and wondering whether to stay there or add answering help: that tradeoff is covered in depth in our Google Voice alternative comparison.
- You want to keep the number customers already have and add call answering behind it: that's the forwarding/porting path above, with Google Voice as the one free-tier option named in Beside's own porting guide, with a documented, waivable $3 port-out fee.