如果您不想依赖运营商的蜂窝网络来拨打和接听电话或短信，WiFi通话是一个很好的解决方案。
您可以使用免费通话应用程序无限拨打电话或发送免费短信( free calling apps to make unlimited calls or send free texts)，但这些仍然需要您的电话服务提供商作为中间人。
WiFi通话可帮助您实现高质量通话，尤其是在您远程工作并需要与团队沟通时(communicate with your team)。如果您有强大的WiFi网络覆盖，您甚至可以通过云电话系统使用 HD（高清(High Definition)）语音(Voice)，在与家人或朋友聊天时享受更清晰、更清晰的通话质量。
在 iOS 设备中，该功能有些隐藏，但我们将分解您需要了解的有关iPhone 上的WiFi 通话的所有信息。(WiFi Calling)
什么是 iPhone 上的 WiFi 通话？(What is WiFi Calling on iPhone?)
WiFi 通话(WiFi Calling)是 iPhone 上的一项隐藏功能，可让您通过 WiFi 连接而不是使用手机连接 拨打和接听视频和语音电话。(make and receive video and voice calls over a WiFi connection)
免费服务依赖于一种称为SIP / IMS (IP Multimedia Subset)的技术，在运营商的手机信号不稳定但您可以访问WiFi的情况下非常有用。当您连接到机场的公共热点或您最喜欢的咖啡店时， WiFi 通话也可以工作。(WiFi Calling)
大多数主要电话运营商都免费提供WiFi通话服务，前提是拨打美国号码。如果您通过WiFi Calling 拨打(WiFi Calling)国际电话，可能需要支付国际费用。语音提示将中断通话，提醒您可能需要支付国际费用。您可以选择完成通话或挂断电话以避免长途费用。
iPhone 上的 WiFi 通话是如何工作的(How WiFi Calling on iPhone Works)
在您可以使用WiFi通话之前，您需要检查您的设备是否兼容并且支持高清语音(HD Voice)（iPhone 6 或更新版本）。此外，您需要提供您的地址，以便在您拨打 911 时紧急服务可以联系到您。
WiFi 呼叫(WiFi Calling)技术通过运营商最近的手机信号塔路由您的语音数据包，并通过互联网将它们通过隧道建立连接。数据包通过网络反弹给您正在与之交谈的人。
简而言之，您正在与其他人进行通信，但您并没有使用传统意义上的手机信号塔来进行通信。
(Apps)Skype、WhatsApp和Facebook Messenger等应用程序都使用互联网协议语音 (VoIP) 技术(Voice over Internet Protocol (VoIP) technology)拨打电话。从根本上说，WiFi 通话(WiFi Calling)使用VoIP来提供更好的通话体验，并消除蜂窝公司为国际通话收取的高额费用，而不会出现任何掉线的情况。
与蜂窝连接不同，蜂窝连接需要蜂窝网络才能连接，从而耗尽设备的电池，而使用WiFi通话则不需要。事实上，使用 iPhone 进行WiFi通话可以延长电池寿命，因为它连接到单个网络并一直存在，直到您断开连接。
WiFi通话的主要缺点是它们可能会受到网络中断的(disruptions in your network)影响，从而影响使用WiFi进行的所有通话。
如何在 iPhone 上启用和使用 WiFi 通话(How to Enable and Use WiFi Calling on iPhone)
默认情况下， iPhone 上的WiFi 通话(WiFi Calling)功能处于禁用状态。您需要进入手机设置才能启用它。
如果您准备好进行WiFi通话，第一步是确保您拥有支持运营商(supported carrier)的 iPhone 5c 或更新机型。
- 前往设置(Settings)并点击电话(Phone)。
- 点击WiFi 通话(WiFi Calling)。
注意(Note)：如果出现提示，请输入或确认您的紧急呼叫或服务地址。当您拨打紧急电话时，您 iPhone 的位置信息可能会用于帮助您做出响应。
- 如果要添加设备，请检查它是否运行最新版本的软件，然后在 iPhone 上转到Settings > Phone > WiFi Calling
- 将Add WiFi Calling for Other Devices切换到On。
- 返回上一个屏幕并点击其他设备上的通话(Calls on Other Devices)。
- 如果未启用，请启用“允许在其他设备上通话”(Allow Calls on Other Devices)选项。
- 在“允许通话”(Allow Calls On)下，您会看到符合条件的设备列表。打开您想使用WiFi 通话(WiFi Calling)的每台设备。
- 确保其他设备将接受来自您的 iPhone 的呼叫。如果您使用的是 iPad，请前往Settings > FaceTime并启用“来自 iPhone 的通话”(Calls from iPhone)。对于 Mac，打开 FaceTime，选择FaceTime > Preferences并启用Calls from iPhone。
注意(Note)：如果您使用的是Apple Watch，当您打开“允许(Allow Calls)在其他设备上通话”时， (Devices)WiFi 通话(WiFi Calling)功能会自动启用。
如果您无法添加设备，请检查您是否在两台设备上为 iCloud 和FaceTime使用相同的(FaceTime)Apple ID 。确保您已启用WiFi 通话(WiFi Calling)、允许(Allow Calls)在其他设备(Devices)上通话，并且您的设备列在允许通话(Allow Calls)下。
享受更清晰的通话而不会中断(Enjoy Clearer Calls Without Interruption)
您是否能够在 iPhone 上使用WiFi Calling通过(WiFi Calling)WiFi拨打免费电话？(WiFi)在下面的评论中与我们分享您的经验。如果您想知道如何通过消息应用程序拨打免费电话，请查看我们的指南，了解如何使用 Siri 拨打 WhatsApp 电话(how to make WhatsApp calls using Siri)或如何在 Mac 和 iOS 上进行群组 FaceTime(how to do Group FaceTime on Mac and iOS)。
How to Make Calls With WiFi Calling on iPhone
If уou don’t want to rely on your carriеr’s cellular network to make and reсеive calls or text messages, WiFi calling is a great solution.
You could use free calling apps to make unlimited calls or send free texts, but these still require your phone service provider as the middleman.
WiFi calling helps you achieve high-quality calls especially when you’re working remotely and need to communicate with your team. If you have strong WiFi network coverage, you can even use HD (High Definition) Voice over a cloud phone system and enjoy clearer, crisper call quality when chatting with family or friends.
In iOS devices, the feature is somewhat hidden, but we’ll break down everything you need to know about WiFi Calling on iPhone.
What is WiFi Calling on iPhone?
WiFi Calling is a hidden feature on the iPhone that allows you to make and receive video and voice calls over a WiFi connection instead of using a cell connection.
The free service depends on a technology called SIP / IMS (IP Multimedia Subset) and is useful where your carrier’s cell signal is spotty, but you can access WiFi. WiFi Calling can also work when you’re connected to a public hotspot at the airport or your favorite coffee shop.
Most major phone carriers offer WiFi calling services at no extra charge, provided the calls are being made to U.S. numbers. If you place an international call over WiFi Calling, international charges may apply. A voice prompt will interrupt the call to remind you that international charges may apply. You can choose to complete the call or hang up to avoid the long distance charge.
How WiFi Calling on iPhone Works
Before you can use WiFi calling, you need to check that your device is compatible and HD Voice capable (iPhone 6 or newer). Plus, you need to provide your address so that emergency services can reach you if you call 911.
WiFi Calling technology routes your voice packets via the carrier’s nearest cell tower, and tunnels them over the internet to establish a connection. The packets are bounced across the network to the person you’re speaking to.
In short, you’re in communication with someone else, but you’re not using a cell tower to do it in the traditional sense.
Apps like Skype, WhatsApp and Facebook Messenger all use Voice over Internet Protocol (VoIP) technology to make calls. Fundamentally, WiFi Calling uses VoIP to deliver a better calling experience and eliminate the high rates that cellular companies charge for international calls without any dropped calls.
Unlike a cellular connection, which requires a cellular network to connect thereby draining your device’s battery, using WiFi calls doesn’t. In fact, WiFi calling with your iPhone could extend your battery life because it connects to a single network and stays there until you disconnect.
The main downside with WiFi calls is that they could be affected by any disruptions in your network, thereby affecting all calls made using WiFi.
How to Enable and Use WiFi Calling on iPhone
By default, WiFi Calling is disabled on your iPhone. You need to go into your phone’s settings to enable it.
If you’re ready to make your WiFi call, the first step is to ensure that you have an iPhone 5c or newer on a supported carrier.
- Go to Settings and tap Phone.
- Tap WiFi Calling.
Note: If prompted to, enter or confirm your address for emergency calls or services. Your iPhone’s location may be used to help in response efforts when you place an emergency call.
- If you want to add a device, check whether it’s running the latest version of software and then go to Settings > Phone > WiFi Calling on your iPhone.
- Toggle the Add WiFi Calling for Other Devices switch to On.
- Go back to the previous screen and tap Calls on Other Devices.
- Enable the Allow Calls on Other Devices option if it’s not on.
- Under Allow Calls On you’ll see a list of eligible devices. Turn on each device you’d like to use with WiFi Calling.
- Ensure that the other devices will accept calls from your iPhone. If you’re using an iPad, go to Settings > FaceTime and enable Calls from iPhone. For Macs, open FaceTime, select FaceTime > Preferences and enable Calls from iPhone.
Note: If you’re using an Apple Watch, WiFi Calling feature is enabled automatically when you turn on Allow Calls on Other Devices.
If you’re unable to add a device, check whether you’re using the same Apple ID for iCloud and FaceTime on both devices. Ensure that you have enabled WiFi Calling, Allow Calls on Other Devices, and that your device is listed under Allow Calls On.
Enjoy Clearer Calls Without Interruption
Have you been able to make free calls via WiFi using WiFi Calling on iPhone? Share with us your experience in a comment below. If you want to know how to make free phone calls via messaging apps, check out our guides on how to make WhatsApp calls using Siri or how to do Group FaceTime on Mac and iOS.
