Apple iOS 18 developer preview version Beta 4 appears with WLAN Calling switch

This site reported on July 24 that Apple today pushed the iOS 18 Developer Preview Beta 4 update (build number: 22A5316j) to iPhone and iPad users.

This site noticed that after this update, the iPhone has added a wireless LAN Calling (WLAN Calling, also known as Wi-Fi Calling) function switch. This feature allows users to make calls over wireless LAN.

▲ Thanks to this site user @JessePinkmen. The function path is as follows:
"Settings" → "Cellular Network" → Select a number (under "SIM Card") → "Wireless LAN Calling" → Turn on "Use on iPhone" Wi-Fi Calling" → Enter or confirm the address used by emergency services
Apple's official website explains as follows:
Emergency calls on iPhone will be sent over cellular network service (when available). If cellular service is unavailable 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 regardless of whether you have Location Services enabled. For first aid purposes. Some carriers may use the address you registered when you registered for Wireless LAN Calling service with your carrier as your location. iPhone may not receive emergency alerts while connected to Wi-Fi for calls.
When the user's "Wireless LAN Calling" is available, "Wireless LAN" will be displayed in the status bar after the operator's name, and all your calls will be made through Wireless LAN.
If the wireless LAN connection is disconnected during the call, the call will automatically switch to the operator's cellular network using VoLTE (Voice over LTE) (if available and turned on. When the wireless LAN connection is available, the VoLTE call will also switch to the wireless LAN) .
According to user feedback, this function currently requires users to upgrade the iOS18 Beta 4 system and use a China Telecom card to trigger the switch button. It should be noted that this function is not yet available and needs to be opened.
WiFi calling is no longer a new technology. According to previous reports, China Telecom officially announced the launch of VoWiFi (Voice over WiFi) service in May last year. The first batch supports WiFi dial-up voice and video calls in Guangzhou, Shenzhen, Dongguan, and Foshan; this year In January, China Telecom announced that it had achieved a breakthrough in "satellite + VoWiFi" in aviation scenarios. Ordinary mobile phone terminals can realize functions such as mobile phone authentication, three-network voice, SMS interoperability and video calls through the in-flight Internet environment in flight mode.
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 on WiFi networks.

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