Onoff eSIM – Review & Full Test 2026

🌍

Countries covered

30 countries

💶

Starting at

4,92 €

📶

Network

5G

📊

Data

Starting at 500 MB

✅

Calls/SMS

Yes

Virtual number solution allowing a second line without changing SIM or phone.

Unlimited calls in Europe and integrated voicemail for separated professional communication.

Travel eSIM available in over 30 countries with local rates and no hidden fees.

Intuitive iOS and Android app with real-time data usage tracking.

Customer support available 24/7 in French and English for all needs.

Official ratings

Destinations & coverage

By region

Key points

✅

Advantages

  • ✓ Smooth and easy-to-use interface, allowing adding a virtual number in minutes.
  • ✓ Unlimited calls in Europe offering excellent value for national communications.
  • ✓ Travel eSIM service with competitive rates in over 30 countries with no additional costs.
  • ✓ Visual voicemail, call forwarding, and caller ID masking for more flexibility.
  • ✓ Responsive customer support available 24/7 to assist users in case of issues.
  • ✓ Automatic contact synchronization and ability to use the service on multiple devices.
⚠️

Disadvantages

  • ✗ Some users report call quality and service reliability issues.
  • ✗ Frequent receipt of spam calls and SMS on newly created numbers, affecting user experience.
  • ✗ Compatibility issues with SMS verification services and third-party apps.
  • ✗ Customer support sometimes unresponsive, with variable response times to requests.
  • ✗ Some numbers may be flagged as associated with scams by fraud detection systems.

Customer reviews

App Store

5/5

“

I have been a fan of the OnOff app since 2016. The features are excellent, the app has improved over time with quality online support and regular fixes. However, I would like a feature to block numbers starting with area codes used by spammers.

May 1, 2025

App Store

4/5

“

The Onoff app is well designed with a smooth and practical interface for having a virtual number. However, I received many spam calls and unsolicited SMS right after buying the number, as if the number was already on spam lists. It's a shame because the concept is excellent, but it cools the user experience.

September 1, 2025

Google Play

5/5

“

Excellent service. The Onoff Care team is very professional and continuously improves the service to offer the best possible user experience.

September 1, 2025

Description

Onoff is a telecom operator recognized by ARCEP offering two services: a secondary virtual number to separate professional and personal life (starting at €4.92/month), and a travel eSIM to access the internet without roaming fees in over 30 countries with local rates. The iOS and Android mobile app syncs contacts, offers visual voicemail, call forwarding, and unlimited calls in Europe, ideal for freelancers and travelers.

How it works

Go to the App Store (iOS) or Google Play (Android) and download the Onoff Numbers or Onoff Travel app according to your needs.

Launch the app and sign up with your email address, phone number, or via your Apple/Google account.

Select the type of service: secondary virtual number (from €4.92/month) or travel eSIM for global internet.

For virtual numbers, choose the country and desired prefix. For the eSIM, select your travel destination.

Pay for your purchase using available methods (bank cards, Apple Pay, Google Pay, PayPal, iTunes).

For the travel eSIM, scan the QR code or follow instructions to install the profile. For the virtual number, activation is immediate.

You can now make calls, send SMS (virtual number), or access the internet (eSIM) directly from the app.

⚠️ If it fails

✅ Check that the 'On/Off' mode is enabled in the app settings. Also ensure your device has a stable internet connection. Restart the app and the device if the issue persists.

✅ Make sure your device is eSIM compatible (iPhone XS and later, some recent Android models). Ensure a stable internet connection during installation. Contact support at [email protected] if the issue continues.

✅ This is a known issue where some numbers preexist on spam lists. Contact support to request another number or update your privacy settings to filter unwanted calls.

✅ Verify that you have purchased international credits and that they have not expired. Make sure you are calling a valid international number. Contact support if credits are not working.

Alternatives

FAQ

For a short stay in Europe, the Onoff Travel eSIM is ideal. You can choose a plan with 5 to 10 GB of data depending on your internet needs. Local rates negotiated with partner operators ensure competitive costs with no roaming fees.

Yes, tethering is generally allowed with Onoff eSIM, but it depends on the local partner network and the terms of the chosen plan. Check specific terms before your trip.

Onoff eSIM is compatible with most modern smartphones: iPhone XS and later, as well as some recent Android models with eSIM functionality. Check the compatibility page on the official website for your specific model.

Yes, eSIM-compatible devices allow simultaneous use of a physical SIM and an eSIM. You can keep your local SIM for calls/SMS and use Onoff eSIM for internet data while traveling.

The Onoff Travel app displays your data usage in real-time. You can check your usage anytime from the app to avoid overages and manage your budget efficiently.

Refund conditions depend on the type of plan and your region. See the terms and conditions on the official website (https://www.onoff.app/en/terms-conditions/) or contact customer support for specific details.

Yes, Onoff customer support is available 24/7 in French and English. You can contact the team via email ([email protected] or [email protected]) or through the in-app chat integrated in the app.

Yes, Onoff Numbers offers the option to port an existing phone number to use within the app. This allows you to keep your current number while enjoying Onoff's service flexibility.

Company info

Legal name: ONOFFAPP OU

Address: Paris, France

Email: [email protected]

Website: https://www.onoff.app

Support

24/7

Accepted payments

Visa, Mastercard, Apple Pay, Google Pay, PayPal, iTunes

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