Our service provides you with a professional UK landline number (01, 02, or 03) that integrates directly with your mobile. Unlike traditional systems, ONSIM operates at the network level, ensuring crystal-clear call quality without the need for apps, Wi-Fi, or mobile data.
For more information visit our website - Virtual Landline
You can choose from two flexible setup modes:
1. Divert Mode
Best for: Ultimate simplicity and quick setup.
How it works: All incoming calls to your business landline are instantly forwarded to your existing mobile number.
Setup: Works on any phone immediately—no configuration required.
Allowance: Allows for up to 2500 minutes per month of inbound diverted calls
2. SIM Mode
Best for: Professionals who want to separate work and personal calls.
How it works: We provide a dedicated SIM or eSIM for your device. You need to ensure you have a supported device for this option.
Key Advantage: You can see instantly on your screen when a call is a business call before you even answer. It also offers superior routing control and higher fair-usage minutes.
Allowance: Allows for up to 5000 minutes per month of inbound diverted calls
Upgrade: Option to upgrade to our Base plan to also include outbound calls from your landline
Why ONSIM is Different
No Apps: No "rubbish" VoIP apps that drain your battery or drop calls when you lose Wi-Fi.
Instant Activation: Be professional and reachable in minutes.
Ready to start?
Join over 6,500 UK businesses today.
Have more questions?
Our UK-based support team is ready to help. 📧 Email us: support@onsim.uk