WiFi Calling allows your smartphone to make and receive voice calls over a WiFi network when your mobile signal is weak or unavailable. Whether you are in a basement, a building with thick stone walls, or a remote rural office, as long as you have WiFi, you have a signal.
Why use WiFi Calling?
Better Indoor Coverage: Perfect for "dead zones" in your home or office where the mobile signal can't penetrate.
No Extra Apps Needed: It works natively. You use your regular phone dialler, your existing contacts, and your ONSIM mobile number.
Superior Call Quality: Enjoy HD-quality audio with fewer dropouts and crystal-clear clarity over any stable WiFi connection.
Seamless Experience: Your phone automatically switches between the mobile network and WiFi without you having to do anything.
✅ Requirements for WiFi Calling
To use this service, ensure the following criteria are met:
Supported Device: Your handset must be compatible with WiFi Calling and must be a supported device on our network.
Enabled Settings: WiFi Calling must be switched ON in your phone’s settings menu.
VoLTE Enabled: Voice over LTE (VoLTE) should also be turned on, as these technologies work together to provide the best performance.
Stable WiFi: You need a stable internet connection (home, office, or public WiFi).
Location: Currently, WiFi Calling is available for ONSIM customers while they are located within the UK.
⚙️ How to Enable WiFi Calling
For iPhone (iOS):
Go to Settings > Phone.
Tap Wi-Fi Calling.
Toggle Wi-Fi Calling on This iPhone to ON.
For Android:
(Settings may vary slightly by manufacturer)
Open the Phone app.
Tap the More (three dots) icon > Settings.
Tap Calls or Connectivity.
Toggle Wi-Fi Calling to ON.
💡 Important Information
Availability: WiFi Calling is now automatically available to all existing and new ONSIM customers in the UK.
Billing: Calls made over WiFi are treated exactly the same as standard mobile calls and will come out of your inclusive ONSIM minutes.
Roaming: If you are traveling abroad, WiFi calling for international "home-zones" will be announced soon. Currently, this feature is for UK use.
Need Help?
If you have enabled the settings but are still unable to connect, our UK-based support team is here to assist:
Email: support@onsim.uk