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.