The short answer is no. Unlike most modern phone systems, ONSIM works at the network level. This means your business calls use the same high-quality voice channels as your personal calls, rather than relying on a mobile data or Wi-Fi connection.
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Why "No App" is Better for Business:
Reliability: No more dropped calls because of a weak Wi-Fi signal.
Battery Life: VoIP apps constantly run in the background and drain your battery; ONSIM does not.
Simplicity: You answer calls using your phone's big, familiar green "Answer" button—no need to unlock your phone and find an app while it's ringing.
Two Ways to Use ONSIM (App-Free)
1. Divert Mode
How it works: We simply "point" your new landline number to your existing mobile number.
The Experience: When someone calls your landline, your mobile rings. You answer it like any other call.
Setup: Instant. No changes to your phone settings are required.
2. SIM Mode
How it works: We provide you with a digital eSIM (or a physical SIM) that you add to your phone.
The Experience: Your phone now has two "lines." When a business call comes in, your screen will clearly show it is for your business number.
Setup: Requires a supported compatible device. For a list of supported devices click here.
Ready to ditch the apps?
Get a professional landline that actually works where you do.
Have a question about your specific phone?
Our team can check if your device supports our advanced SIM features.
📧 Email us: support@onsim.uk