ONSIM

If you are using ONSIM for your business, you can easily connect your service to WhatsApp or WhatsApp Business. Because ONSIM numbers function natively at the network level, they are fully compatib...

Before you begin the upgrade, please ensure you have a supported device. To make outbound calls showing your landline number, you must use an ONSIM SIM or eSIM in a handset that supports VoLTE (Voi...

Whether there is a fee depends on the type of service you are using. Please see the breakdown below:📱 Landline SIM - Mobile Numbers  Port-in Fee: £0 (Completely Free) Failed/Subsequent Ports: £0 (N...

Whether there is a fee depends on the type of service you are using. Please see the breakdown below:📱 Landline SIM - Mobile Numbers  Port-in Fee: £0 (Completely Free) Failed/Subsequent Ports: £0 (N...

If your eSIM is installed but you have no service, the most common reason is simply that the line is "Turned Off" within your phone's cellular settings. Follow this guide to ensure your eSIM is act...

"One-way audio" is a common communication glitch where audio only travels in one direction. Depending on whether you are using an ONSIM SIM in a mobile device or a VoIP Desk Phone/Handset, the cau...

SMS issues are often separate from data or voice problems. If you are struggling to send or receive texts—especially Two-Factor Authentication (2FA) codes—follow this diagnostic guide.1. The "Numbe...

When you have both a landline and a mobile number associated with your ONSIM SIM, you have full control over which one people see when you call them. If the "wrong" number is appearing, it’s usuall...

Moving to an eSIM is convenient, but the activation process requires a few specific conditions to be met. If you are seeing errors like "eSIM cannot be added" or "QR Code no longer valid," follow t...

Since ONSIM records at the network level, your calls should be captured automatically without the need for apps. If you notice a gap in your recording logs, use this checklist to identify and fix t...