Apple's iOS 18 developer preview version Beta4 has a WiFi calling switch

Original title: Apple’s iOS 18 Developer Preview Beta 4 appears with telecom WLAN Calling switch. IT House reported on July 24 that Apple today pushed the iOS 18 Developer Preview Beta 4 update to iPhone and iPad users (internal version number: 22A5316j ).

IT House 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 IT House user @JessePinkmen

The function path is as follows:

1. "Settings"
2. "Cellular Network"
3. Select a number (under "SIM Card")
4. "Wireless LAN Calling"
5. Turn on "Call over Wi-Fi on iPhone"
6. 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 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 after the operator name in the status bar, 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; In January this year, China Telecom announced that it had achieved a breakthrough in the aviation scene with "satellite + VoWiFi". 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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