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IT Home reported on July 24 that Apple today pushed the iOS 18 developer preview Beta 4 update (internal version number: 22A5316j) to iPhone and iPad users.

IT Home noticed that after this update, iPhone addedWLAN Calling (also known as Wi-Fi Calling) function switchThis feature allows users to make calls via wireless LAN.

▲ Thanks to IT Home user @JessePinkmen

The function path is as follows:

• Settings → Cellular → Choose a plan (under SIM Cards) → Wi-Fi Calling → Turn on Wi-Fi Calling on iPhone → Enter or confirm the address used by emergency services

Apple's official website describes it as follows:

Emergency calls on iPhone are sent over cellular service when available. If cellular service isn’t available and you have Wi-Fi Calling enabled, emergency calls may be made over Wi-Fi and your device’s location may be used for emergency calls, whether or not you have Location Services enabled, for emergency response purposes. Some carriers may use the address you registered with your carrier when you signed up for Wi-Fi Calling as your location. iPhone may not receive emergency alerts while connected to Wi-Fi Calling.

When Wi-Fi calling is available, "Wi-Fi" will be displayed after the operator name in the status bar, and all your calls will be made through Wi-Fi.

If the Wi-Fi connection is lost during a call, the call automatically switches to the carrier's cellular network using VoLTE (Voice over LTE), if available and turned on. VoLTE calls also switch to Wi-Fi when a Wi-Fi connection is available.

According to user feedback, this feature currently requires users toUpgrade to iOS18 Beta 4 system and use China Telecom card to trigger the switch button.have to be aware of is,This feature is not yet available, still need to wait for opening.

WiFi calling is not a new technology. According to previous reports, China Telecom officially launched the VoWiFi (Voice over WiFi) service in May last year, which first supported WiFi dial-up voice and video calls in Guangzhou, Shenzhen, Dongguan and Foshan. In January this year, China Telecom announced a breakthrough in "satellite + VoWiFi" in aviation scenarios. Ordinary mobile phone terminals can use the onboard Internet environment in flight mode to realize functions such as mobile phone authentication, three-network voice, SMS intercommunication and video calls.

In addition, China Unicom’s official app has a built-in phone applet, which is briefly described as “wifi calling” and is expected to support the function of making calls over WiFi networks.