Onoff
At #5 of 13 in our virtual phone number apps ranking, Onoff is summed up in the catalogue as: Second mobile number in an app, French numbers on the base plan.
Sebastiaan SmitsFounderPaid placement exists here and is disclosed. Whatever the arrangement, the Onoff link carries the same marker as all others (details).
Visit Onoff See it in the virtual phone number apps ranking
At a glance
| Headquarters | Not stated by the vendor |
|---|---|
| Pricing model | Monthly plans in euros with a Premium add-on; business tiers published; trial offered |
| API | Nothing recorded about an API |
| Deployment | Desktop software |
| Free plan | Paid only, as far as we recorded |
| Best for | Users in France wanting a second line without a second SIM |
What is Onoff?
Onoff is an app that gives a smartphone a second mobile number without a separate SIM card or device. The English homepage describes Onoff Telecom as a telecommunications operator recognised by ARCEP, the French telecoms regulator, and lists two addresses, one in Paris, France and one in Tallinn, Estonia, without stating which is the registered office.
The base plan starts at €4.92 a month billed monthly and includes one French mobile number, 1,000 national call minutes and 1,000 national SMS and MMS. A Premium option adds desktop calling, call scheduling and several devices ringing at once for €2.99 more a month. A business site publishes three tiers: Connect, Advanced and Max. The homepage states that a free trial is offered. Apps exist for iOS and Android.
Onoff key features
- Second number without a SIM. The app adds a mobile number to a smartphone without a second SIM or device. The base plan carries a French mobile number with national minutes and texts included.
- Visual voicemail and On/Off mode. The homepage lists visual voicemail and an On/Off mode that works as do not disturb for the second number, handy for keeping work calls out of private hours.
- Forwarding and hidden caller ID. Call forwarding and hidden caller ID are listed, along with SMS and MMS. International calls are available using credits rather than the plan allowance.
- Premium option. For €2.99 a month more, Premium adds calling from a desktop, call scheduling and several devices ringing at once. These features are not part of the base plan.
- Business plans. Connect, Advanced and Max cover teams. Advanced adds call recording and two integrations, and Max lists unlimited integrations, with Salesforce named among them.
- Europe calling. Connect lists 600 minutes to Europe, and Max lists unlimited calls to Europe. Allowances differ by tier, so heavy cross-border callers should compare them.
- Onboarding and priority support. The Max plan includes personalised onboarding, user training and priority support. Lower tiers do not list these services.
Who Onoff suits
- Individuals wanting a French number. The base plan from €4.92 a month gives one French mobile number with 1,000 national minutes and 1,000 national SMS and MMS, without carrying a second phone.
- Small teams on French lines. Connect at €15 a month adds reporting and 2,000 national minutes per line, and Advanced adds call recording, which suits a team that reviews calls.
- Sales teams tied to Salesforce. Max lists unlimited calls to Europe and unlimited integrations, with Salesforce named, for teams that want calls logged in a CRM.
Getting started with Onoff
The homepage offers a free trial without giving its length. Install the app for iOS or Android, take the base plan with one French mobile number, and decide whether the Premium option is needed for desktop calling or several ringing devices. Business buyers use the separate business site, which lists Connect, Advanced and Max.
The business page shows euro prices with a monthly or annual toggle marked -25%, and the English section does not state the billing period of each figure, so confirm it before paying. International calls use credits. The pages we read describe offers rather than a setup procedure, so ask Onoff how number porting and identity checks work.
Our verdict on Onoff
Onoff Telecom describes itself as an operator recognised by ARCEP, the French regulator, and lists addresses in Paris and Tallinn without naming the registered office.
The base plan carries one French mobile number with 1,000 national minutes and 1,000 national texts, Desktop calling, scheduling and several ringing devices need the Premium option. The English business section does not state the billing period of each figure.
The virtual phone number apps list places Onoff 5 of 13: it follows MySudo and comes before Ring4. No numeric score is attached; established products follow the challengers in their ranked order.
The vendor states no country of establishment, so Onoff is left out of the regional count for this list.
The case for and against Onoff
- Onoff Telecom describes itself as an operator recognised by ARCEP, the French regulator, and lists addresses in Paris and Tallinn without naming the registered office.
- Onoff is tagged Visual voicemail in our records.
- Suits: Users in France wanting a second line without a second SIM.
- Catalogue tag: Business tiers.
- French numbers is among the traits we single out for it.
- Not for: Callers who need local numbers in many different countries.
- Two addresses are shown and the registered office is not named.
- The base plan is built around a French number, which limits use for callers elsewhere.
Onoff pros and cons in practice
- Consumer and business plans are published in euros.
- The base plan lists 1,000 national minutes and 1,000 national SMS and MMS.
- A free trial is stated on the homepage.
- The company describes itself as an operator recognised by ARCEP.
- The base plan carries a French number, which may not suit users wanting other countries.
- Desktop calling, scheduling and several ringing devices require the Premium option.
- The English business section does not state the billing period of each figure.
- Addresses in Paris and Tallinn are given without a registered office.
Onoff in practice
Call recording starts at Advanced, which also includes two integrations.
Max adds personalised onboarding, training and priority support.
Salesforce is the one named integration.
What Onoff costs
Pricing as recorded: Monthly plans in euros with a Premium add-on; business tiers published; trial offered.
The base plan is listed from €4.92 a month billed monthly, with one French mobile number, 1,000 national call minutes and 1,000 national SMS and MMS. Premium is +€2.99 a month billed monthly. The business site lists Connect at €15 a month with one French mobile line, 2,000 national minutes, 600 minutes to Europe, 2,000 national SMS and reporting, with the French section showing a discounted €12. Advanced is €30 a month with 4,000 national minutes, call recording and two integrations. Max is €49 a month with unlimited national calls and SMS, unlimited calls to Europe and unlimited integrations. Business prices are in euros with a monthly or annual toggle marked -25%, and the English section does not state the billing period of each figure. The homepage states that a free trial is offered.
Where this comes from: the vendor pages at onoff.app, checked for Best Virtual Phone Number Apps in 2026 on 13 November 2026.
Onoff: data and security
The homepage describes Onoff Telecom as an operator recognised by ARCEP, with a footer copyright of 2025, and lists addresses in Paris and Tallinn without naming the registered office. The pages we read do not describe data storage locations, certifications or encryption, and the country of establishment is not stated by the vendor.
Onoff integrations and ecosystem
Integrations the vendor names (7):
- Salesforce
- iOS app
- Android app
- Desktop calling (Premium)
- Call recording (Advanced)
- Reporting (Connect)
- Visual voicemail
Also in our records:
- Call recording starts at Advanced, which also includes two integrations.
- Salesforce is the one named integration.
Onoff in numbers and labels
| Product | Onoff |
|---|---|
| Vendor website | onoff.app |
| Head-to-head pages | Not paired so far |
| Not in our data | user counts and financial results |
| Catalogue tags | French numbers, Business tiers, Visual voicemail |
| Primary guide | Best Virtual Phone Number Apps in 2026 |
| Rank there | #5 of 13 |
| Price visibility | A price or free offer is shown |
| Headquarters | Not stated by the vendor |
| Alternatives page | Not written yet |
Where else Onoff is ranked
| Guide | Position |
|---|---|
| Best Virtual Phone Number Apps in 2026 | #5 of 13 |
Close alternatives to Onoff
The choice below rests on shared catalogue tags, price model, free plan and region, with rank distance as the tie-break.
- Ring4 (#6 of 13): Shared business number for teams with an AI receptionist. Watch out: the homepage shows a higher per-user figure than the pricing page, so the real price needs confirming.
- CallHippo (#7 of 13): Not for: buyers who need one clean, consistent price list. Cloud phone system with numbers in over 150 countries.
- Line2 (#8 of 13): One-plan second line with US and Canada numbers. Watch out: international calls and texts are billed as overages, so a user abroad faces extra charges.
- TextNow (#9 of 13): Not for: businesses wanting a shared team number or call routing. Phone service with an included number, from ad-supported to unlimited.
- Google Voice (#13 of 13): Suits: Companies already on Workspace that want numbers tied to Gmail and Calendar.
Onoff: questions
9 answersIs Onoff the right fit for me?
Users in France wanting a second line without a second SIM. It is a weaker match for the following: callers who need local numbers in many different countries.
Is Onoff a European company?
The vendor pages we reviewed state no country of establishment for Onoff, so we do not give one.
Where does Onoff stand among virtual phone number apps?
The virtual phone number apps ranking has Onoff at position 5 out of 13.
How much does Onoff cost?
The pricing entry for Onoff reads: Monthly plans in euros with a Premium add-on; business tiers published; trial offered. On free access, nothing is free to use, as far as we recorded.
What else should I look at besides Onoff?
Start with Ring4, CallHippo, Line2, TextNow and Google Voice. All of them are reviewed in the same ranking.
Where is Onoff based?
The homepage lists addresses in Paris, France and Tallinn, Estonia, and does not say which is the registered office. It describes Onoff Telecom as recognised by ARCEP.
What does the base plan include?
One French mobile number, 1,000 national call minutes and 1,000 national SMS and MMS, from €4.92 a month billed monthly.
Is there a trial?
The homepage states that a free trial is offered but does not give its length.
What do business plans cost?
Connect €15, Advanced €30 and Max €49 a month, with the French section showing a discounted €12 for Connect.
Onoff: sources
Read from the vendor’s own pages on 12 November 2026.
- onoff.app/en: Second number, base plan, Premium, trial, features, apps, ARCEP, addresses
- business.onoff.app/en/offers: Connect, Advanced and Max prices and allowances, Salesforce, onboarding, billing toggle
How we rank
Feature lists tell little, so positions rest on setup effort, the true price, portability and fit. Onoff ends up at #5 among 13. Method and commercial relationships are in our editorial process.