Onoff Review 2026 - Is Onoff's eSIM reliable?
At a glance
Reviews & ratings
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.
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.
Excellent service. The Onoff Care team is very professional and continuously improves the service to offer the best possible user experience.
Pros & cons
👍 What we like
- ✓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.
👎 What we like less
- ✗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.
What is Onoff?
What is Onoff?
Onoff is a telecommunications operator recognized by ARCEP that is revolutionizing communication by allowing users to have multiple phone numbers in a single app, without needing to change SIM or phone. The platform offers two distinct services: a secondary virtual number service (Onoff Numbers) to separate professional and personal life, and a travel eSIM service (Onoff Travel) to access the internet globally.
With Onoff Numbers, users benefit from unlimited calls and SMS in Europe, visual voicemail, call forwarding, and the ability to hide their caller ID. The service works on iOS and Android without modifying the existing SIM.
Onoff Travel offers an eSIM to access the internet in over 30 countries with local rates negotiated with partner operators, with no hidden fees or extra costs. Users can purchase data before or during their trip and monitor their usage in real-time from the app.
Plans overview
Countries covered by Onoff
Coverage broken down by region. Tap a region to see its countries.
Our verdict
Onoff is a flexible communication solution that allows you to have a second virtual phone number without changing SIM or device. Available as a mobile app and travel eSIM, Onoff offers calls, SMS, and internet data in over 30 countries at competitive rates.
Popular alternatives
Frequently asked questions
No, Onoff is not a scam: it is a reliable, well-known eSIM with a 4/5 rating in our test and access to local 4G/5G networks (speed depends on local coverage). Just make sure your phone is eSIM-compatible before buying.
Onoff covers many destinations. Availability and network quality depend on the destination and the local partner operator: check that your travel country is covered before buying.
The main downsides we found in our test: 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 and Some numbers may be flagged as associated with scams by fraud detection systems.
It depends on your destination and budget: Onoff scores 4/5 in our test, but the best value changes by country. Compare current deals in our comparator before choosing.
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.