What is VoWiFi (Voice over Wi-Fi)?

VoWiFi allows you to make voice calls and send SMS using a Wi-Fi connection instead of the mobile network. Your phone routes the call or message through Wi-Fi when the cellular signal is weak or unavailable.

VoWiFi is an advanced communication feature that allows users to make voice calls and send SMS using a Wi-Fi connection, instead of relying solely on a mobile network. It ensures seamless connectivity and high-quality voice and SMS services — even in areas with poor or no cellular coverage.

Whether you're indoors, underground, or in remote high-rise buildings, VoWiFi keeps you connected, using any available Wi-Fi network.

When is VoWiFi Useful?

VoWiFi enhances your connectivity in situations where mobile signals struggle to reach:

Low or No Indoor Signal – such as basements, thick-walled buildings, or congested indoor areas

High-Rise Buildings – where mobile network coverage may be limited on upper floors

Temporary Network Disruptions – during large-scale events or emergencies when mobile networks are congested or temporarily restricted.

FAQs - VoWiFi (Voice over Wi-Fi)

What is VoWiFi and how does it work?
VoWiFi allows you to make voice calls and send SMS using a Wi-Fi connection instead of the mobile network. Your phone routes the call or message through Wi-Fi when the cellular signal is weak or unavailable.
Do I need to install any app to use VoWiFi?
No additional app is required. VoWiFi is built into most modern smartphones. You just need to enable it from your phone’s settings (under Wi-Fi Calling or VoWiFi).
Does VoWiFi work when mobile signal is completely unavailable?
Yes, as long as you are connected to a stable Wi-Fi network, VoWiFi allows you to make and receive calls and send SMS even when mobile signal is very weak or absent.
Is there any extra charge for using VoWiFi?
No, VoWiFi calls and SMS are charged just like regular calls and SMS according to your existing package or plan. There are no additional charges for using the Wi-Fi network.
Will my number remain the same when using VoWiFi?
Yes, your number stays the same. VoWiFi simply uses Wi-Fi as the medium, but your identity and number remain unchanged.
How do I activate VoWiFi on my phone?
Go to Settings → Mobile Network or Connections → Wi-Fi Calling → Turn it ON. Make sure your device and SIM are VoWiFi compatible.
What if I move out of Wi-Fi range during a VoWiFi call?
Your call may drop unless your phone supports seamless switching between Wi-Fi and mobile networks (VoLTE handover). Experience may vary depending on your device.
Is VoWiFi secure?
Yes, VoWiFi calls are encrypted and secure, just like regular mobile calls.
Which devices support VoWiFi?
Most modern smartphones support VoWiFi, including popular models from Samsung, Apple, Huawei, Xiaomi, and others. For a full list of compatible devices, please check [Zong’s VoWiFi support page].