当您的 iPhone 无法连接到您的蜂窝服务提供商时，它会显示“无服务”通知。不幸的是，如果您住在手机接收信号较弱的地区，那么您可能不得不忍受很多。如果不是，则可能是由于软件有问题或网络设置配置不正确。
通过下面的解决方案列表，您应该能够修复 iPhone 上的“无服务”问题并再次开始拨打和接听电话。
1. 开启/关闭飞行模式
打开和关闭飞行模式(Airplane Mode)有助于重启 iPhone 内的蜂窝无线电。这应该可以消除固件中的小故障，阻止它与您的无线运营商连接。
首先从屏幕左上角向下滑动以调出控制中心(Control Center)。然后，点击飞行模式(Airplane Mode)图标并等待 10 秒钟，然后再次点击它。
2.激活数据漫游
如果您在出国旅行时看到“无服务”错误，您的 iPhone 可能已禁用漫游。要解决此问题，请转到“设置”(Settings ) > “蜂窝网络(Cellular )” > “蜂窝数据选项”，然后打开“(Cellular Data Options )数据漫游(Data Roaming)”旁边的开关。
当您不主动使用设备时，您可能需要禁用漫游以避免过度收费。但是，如果您已经与运营商建立了漫游计划，那应该不是问题。
3.关闭自动网络选择(Off Automatic Network Selection)
手动选择正确的无线网络也可以解决 iPhone 上的“无服务”问题。
首先(Start)打开 iPhone 的“设置”(Settings)应用，然后选择“蜂窝(Cellular )网络” > “网络选择(Network Selection)” 。然后关闭Automatic旁边的开关。在随后显示的运营商列表中，选择您的蜂窝服务提供商。
4.在语音(Between Voice)和数据(Data)设置之间切换
在蜂窝连接的语音和数据设置之间切换可以“推动”您的 iPhone 与您的移动运营商进行通信。
为此，请转到设置(Settings )>蜂窝(Cellular )网络>语音和数据(Voice & Data)，然后调整可用的数据选项（5G、4G、3G等）和语音配置。
5. 激活 Wi-Fi 通话
您(Did)是否知道即使附近有多个手机信号塔，也可能在室内出现弱蜂窝信号？进入建筑物的建筑材料类型和周围建筑物的破坏性干扰通常会导致这种情况。但是，如果你能在外面的 iPhone 上接收到信号，你就知道问题所在了。
投资蜂窝中继器是在您经常去的地方（例如您的家）增强微弱信号的好方法。但您也可以尝试在 iPhone 上激活 Wi-Fi 通话(activating Wi-Fi calling on the iPhone)作为临时修复。
前往“设置”(Settings ) > “蜂窝(Cellular )网络” > “ Wi-Fi 通话” ，然后打开(Wi-Fi Calling)“此 iPhone 上的 Wi-Fi 通话”(Wi-Fi Calling on This iPhone)旁边的开关。
6.重启你的 iPhone
重新启动 iPhone 可以解决大多数随机出现的问题。如果您继续看到“无服务”错误，请立即尝试这样做。
首先点击设置(Settings )>常规(General)下的关机(Shut Down )。然后，按住电源(Power)图标并将其向右拖动以关闭设备。屏幕变暗后，请等待至少 30 秒，然后按住侧面(Side)按钮重新启动。
7.强制重启你的 iPhone
如果“无服务”错误伴随着系统范围的冻结，阻止您正常重启 iPhone，强制重启可能会有所帮助。这涉及根据设备型号按特定顺序按下或按住一组按钮。
iPhone 8 系列及更新机型：(iPhone 8 series and Newer:)按下并松开提高音量(Volume Up)按钮，按下并松开降低音量(Volume Down)按钮，然后按住侧边(Side )按钮，直到看到Apple标志。
iPhone 7 和 iPhone 7 Plus：(iPhone 7 and iPhone 7 Plus:)同时按住侧边(Side )按钮和降低音量(Volume Down)按钮，直到Apple标志出现在屏幕上。
iPhone 6s Plus 及更早机型：(iPhone 6s Plus and Older:)同时按住侧边(Side )按钮和主(Home )屏幕按钮，直到看到Apple标志。
8. 检查运营商设置更新(Carrier Settings Update)
由于 iPhone 上的运营商设置问题，也可能出现“无服务”状态错误。您的移动运营商可能已推送更新以解决此问题。但是，如果您没有收到要求您安装它的自动提示，则必须手动触发更新。
首先连接到 Wi-Fi 网络。然后，转到设置(Settings )>常规(General )>关于(About )并向下滚动，直到您看到与您的运营商相关的详细信息。
等待至少 30 秒。如果屏幕上弹出运营商设置更新通知，请点击(Carrier Settings Update)更新(Update )以应用它。
9.更新系统软件
较新(Newer)版本的 iOS 可能包含对已知软件相关故障的修复，这些故障会导致 iPhone 上出现“无服务”状态。如果您最近没有更新您的 iOS 设备，请前往“设置”(Settings ) > “通用(General )” > “软件更新”(Software Update)，然后点击“下载并安装(Download and Install)” 。
有时，iOS 更新也会引入问题。发生这种情况时，后续更新应迅速处理它们。如果你等不及了，你唯一的办法就是降级 iPhone 的系统软件(downgrade the iPhone’s system software)。
10. 弹出并重新插入 SIM
另一个快速解决方法是取出SIM卡并将其重新插入 iPhone。为此，您可以使用设备的SIM 卡(SIM)弹出工具或弯曲的回形针。iPhone 12 及更高版本的SIM卡托盘位于设备左侧，而旧型号则位于右侧。
在将 SIM卡放回内部之前，最好用柔软的干布清洁SIM卡上的触点。您也可以尝试将其插入另一部智能手机，以排除 SIM 故障引起的问题(rule out issues caused by a malfunctioning SIM)。
11. 设置正确的日期和时间
iPhone 上的日期和时间错误可能会导致应用程序和服务出现许多问题，包括与移动运营商的连接问题。
要解决此问题，请转到“设置”(Settings ) > “通用(General )” > “日期和时间”(Date & Time)，然后关闭“自动设置(Set Automatically)”旁边的开关。然后手动设置设备上的时间。确保将其设置为与您所在国家或地区的时区相匹配。
12.重置网络设置
损坏(Corrupt)和冲突的网络设置可能会继续阻止您的 iPhone 与您的无线服务提供商进行通信。将它们重置为默认配置会有所帮助。
要启动网络设置重置，请转至设置(Settings )>常规(General )>重置(Reset )，然后点击重置网络设置(Reset Network Settings)。
重置过程后，您可能会收到更新运营商设置的提示。但最有可能的是，这应该在后台自动发生。
13. 打电话给你的运营商
如果上述解决方案均无效，请尝试联系您的无线运营商寻求帮助。您可能遇到特定于您的手机帐户的问题，只有致电客户支持才能解决此问题。
还在 iPhone 上收到“无服务”吗？联系苹果(Contact Apple)
大多数情况下，切换飞行模式(Airplane Mode)或重新启动 iPhone 几乎总能解决“无服务”问题。但是，即使打电话给您的移动运营商也没有解决问题，您可能正在查看有缺陷的蜂窝调制解调器或其他与硬件相关的问题。因此，您的下一步行动应该是在当地的 Genius Bar 酒吧预约(book an appointment at the local Genius Bar)。
Getting “No Service” on Your iPhone? 13 Ways to Fix
Your іPhone displays a “No Service” notification when it fails to connect to your cеllular servіce provider. Unfortunately, if you live in an area with weak cell рhone reception, that’s something you may have to put uр wіth a lot. If not, it’s likely due to buggy software or incоrreсtly configured network sеttings.
Work your way through the list of solutions below, and you should be able to fix the “No Service” issue on the iPhone and start making and receiving calls again.
1. Toggle Airplane Mode On/Off
Switching Airplane Mode on and off helps reboot the cellular radio inside your iPhone. That should eliminate minor glitches in the firmware preventing it from connecting with your wireless carrier.
Start by swiping down from the top-left of the screen to bring up the Control Center. Then, tap the Airplane Mode icon and wait 10 seconds before tapping it again.
2. Activate Data Roaming
If you see the “No Service” error while traveling abroad, you probably have roaming disabled on your iPhone. To fix that, go to Settings > Cellular > Cellular Data Options and turn on the switch next to Data Roaming.
You may want to disable roaming when you aren’t actively using the device to avoid excessive charges. However, that shouldn’t be a problem if you already have a roaming plan set up with your carrier.
3. Turn Off Automatic Network Selection
Manually selecting the correct wireless network can also resolve the “No Service” issue on your iPhone.
Start by opening your iPhone’s Settings app and select Cellular > Network Selection. Follow by turning off the switch next to Automatic. On the list of carriers that then shows up, pick your cellular service provider.
4. Switch Between Voice & Data Settings
Switching between your cellular connection’s voice and data settings can “nudge” your iPhone into communicating with your mobile operator.
To do that, head over to Settings > Cellular > Voice & Data and fiddle with the available data options (5G, 4G, 3G, etc.) and voice configurations.
5. Activate Wi-Fi Calling
Did you know weak cellular reception can occur indoors, even with multiple cell towers nearby? The type of construction material that goes into a building and destructive interference from surrounding buildings often cause that. But, if you can get a signal on your iPhone outside, you’ve figured out the problem.
Investing in a cellular repeater is a terrific way to boost weak signals in places you frequent, such as your home. But you can also try activating Wi-Fi calling on the iPhone as a temporary fix.
Go to Settings > Cellular > Wi-Fi Calling and turn on the switch next to Wi-Fi Calling on This iPhone.
6. Restart Your iPhone
Restarting your iPhone can fix most issues that crop up randomly. If you continue to see the “No Service” error, try doing that now.
Start by tapping Shut Down under Settings > General. Then, hold and drag the Power icon to the right to turn off the device. Once the screen goes dark, wait for at least 30 seconds before holding down the Side button to reboot it.
7. Force-Restart Your iPhone
If the “No Service” error is accompanied by a system-wide freeze preventing you from rebooting your iPhone normally, a force-restart can help. That involves pressing or holding down a set of buttons in a specific order depending on the device model.
iPhone 8 series and Newer: Press and release the Volume Up button, press and release the Volume Down button, and press and hold down the Side button until you see the Apple logo.
iPhone 7 and iPhone 7 Plus: Hold the down the Side and Volume Down buttons at the same time until the Apple logo shows up on the screen.
iPhone 6s Plus and Older: Hold down the Side and Home buttons simultaneously until you see the Apple logo.
8. Check for Carrier Settings Update
The “No Service” status error can also occur due to issues with the carrier settings on your iPhone. Your mobile operator may have pushed an update to fix that. However, if you didn’t receive an automatic prompt asking you to install it, you must trigger the update manually.
Start by connectivity to a Wi-Fi network. Then, go to Settings > General > About and scroll down until you see the details related to your carrier.
Wait for at least 30 seconds. If a Carrier Settings Update notification pops up on the screen, tap Update to apply it.
9. Update the System Software
Newer versions of iOS can potentially include fixes for known software-related faults that result in the “No Service” status on the iPhone. If you haven’t updated your iOS device recently, go to Settings > General > Software Update and tap Download and Install.
Occasionally, iOS updates can also introduce issues. When that happens, a subsequent update should quickly take care of them. If you can’t wait, your only recourse is to downgrade the iPhone’s system software.
10. Eject & Re-Insert SIM
Another quick fix involves taking out and re-inserting the SIM card into your iPhone. You can use the device’s SIM ejector tool or a bent paper clip for that. The iPhone 12 and later have the SIM tray on the left side of the device, while older models have it on the right.
It’s also best to clean the contacts on the SIM card with a soft dry cloth before putting it back inside. You could also try inserting it into another smartphone to rule out issues caused by a malfunctioning SIM.
11. Set Correct Date & Time
Having the wrong date and time on an iPhone can cause numerous issues with apps and services, including connectivity problems with mobile operators.
To fix that, go to Settings > General > Date & Time and turn off the switch next to Set Automatically. Follow by setting the time on the device manually. Make sure to set it up to match the time zone in your country or region.
12. Reset Network Settings
Corrupt and conflicting network settings can continue to prevent your iPhone from communicating with your wireless service provider. Resetting them to their default configurations can help.
To initiate a network settings reset, go to Settings > General > Reset and tap Reset Network Settings.
After the reset procedure, you may receive a prompt to update your carrier settings. But most likely, that should happen automatically in the background.
13. Call Your Carrier
If none of the solutions above worked, try contacting up your wireless carrier for help. You may have an issue specific to your cellular account that nothing but a call to customer support can fix.
Still Getting “No Service” on iPhone? Contact Apple
Most of the time, toggling Airplane Mode or restarting your iPhone almost always resolves the “No Service” issue. However, if even ringing up your mobile operator didn’t do anything to fix the problem, you could be looking at a defective cellular modem or another hardware-related issue. So your next course of action should be to book an appointment at the local Genius Bar.
