VoWifi (Voice over Wi-Fi)

Keeping customers connected without a mobile signal

What is VoWi-Fi?

VoWi-Fi simply stands for voice over (EPC-integrated) Wi-Fi. VoWi-Fi is a complementary technology to VoLTE and utilises IMS technology to provide a packet voice service that is delivered over IP via a Wi-Fi network. Where possible, VoLTE calls may be seamlessly handed over between LTE and Wi-Fi and vice versa. Conversational video is also possible via Wi-Fi (see ViLTE).

Who is VoWi-Fi valuable for?

  • Operators; and
  • Consumers.

What are the benefits of VoWi-Fi?

Both end users and those in the mobile industry will benefit from Voice over Wi-Fi.


  • Can make calls without the need for a mobile signal (e.g. in a remote location or in a property with thick walls);
  • Benefit from security being based on SIM-based authentication as for VoLTE; and
  • Experience better indoor coverage.


  • Unlock revenue opportunities;
  • Leverage existing SIM-based security and authentication as for VoLTE;
  • Gain the opportunity to access IMS-based services via Wi-Fi access;
  • Issue a single bill for the user for all IMS-based services across different access types;
  • Ensure ongoing relevance with customers;
  • Gain competitive advantage; and
  • Benefit from voice/video telephony services provided by IMS and the MMTEL application server as for VoLTE/ViLTE.

What is the GSMA doing to help in relation to VoWi-Fi?

We are working with the mobile industry to help operators realise the benefits of, and to effectively adopt, all-IP VoWi-Fi as part of their core services.

To learn more, explore the All-IP Business Guide

The GSMA’s All-IP Business Guide will direct you to lots of valuable resources on implementing, and maximising the potential of, Advanced Communications.