IMPORTANT: This article applies only to specific products and/or operating systems. Check Applicable Products and Categories for details.
What is VoWiFi?
VoWiFi (Voice over Wi-Fi) is a telephony service provided by your network operator. It means that your network operator provides a voice call service using Wi-Fi.
To use VoWiFi or Wi-Fi Calling, your device needs
- operator-customised software
- your subscription (incl. SIM card) must support Wi-Fi Calling for the device model you're using.
To check if your subscription and SIM card support VoWiFi/Wi-Fi Calling, contact your mobile network operator.
To make a VoWiFi call, you need the recipient's phone number. But, your network operator decides if VoWiFi/Wi-Fi Calling is enabled or not in your device.
What is VoIP?
VoIP (Voice call over IP) is a SIP (Session Initiation Protocol) call technology using IP packet data service. In other words, it's an online call.
Although a SIM card is not required, you still need an IP connecting (Wi-Fi or mobile data) and access to the internet.
That's why VoIP calls are not operator dependant.