这些因素会影响 iPhone 上的蜂窝数据连接：网络覆盖差(poor network coverage)或服务中断、操作系统过时、系统更新漏洞百出、日期和时间设置不正确等。
SIM 卡(Problems with your SIM card)出现问题也可能导致蜂窝数据问题。在本教程中，我们将重点介绍 11 种可能的修复方法，以在您的 iPhone 无法通过蜂窝数据连接到互联网时尝试。
1.检查蜂窝数据设置
如果您有移动数据计划但无法上网，请检查您的 iPhone 是否已配置为使用蜂窝数据。打开 iPhone 的控制中心(Control Center)，点击天线图标(antenna icon)，并确保它呈绿色亮起。
或者，转到设置(Settings)>蜂窝(Cellular)（或移动数据(Mobile Data)）并打开蜂窝数据(Cellular Data)（或移动数据(Mobile Data)）。如果已启用，请关闭蜂窝数据(Cellular Data)并重新打开。
如果蜂窝数据不适用于某些应用程序或后台进程，您应该关闭“低数据模式”。(Low Data Mode)该功能通过禁用数据密集型后台进程（如自动应用程序更新、数据同步和备份等）来减少蜂窝数据的使用。
在蜂窝数据(Cellular Data)（或移动数据(Mobile Data)）菜单中，选择蜂窝数据选项(Cellular Data Options)，然后关闭低数据模式(Low Data Mode)。
最后，确保“语音和数据”选项设置为VoLTE 或 LTE——(VoLTE or LTE)如果您的运营商不支持VoLTE。
如果您有国际数据计划并且您不在您所在的地区或国家/地区，请切换到数据漫游。(Data Roaming)有关您的数据计划的更多信息，请联系您的网络提供商。
2. 检查您的数据计划状态
如果没有数据计划，您将无法访问互联网或在 iPhone 上使用依赖互联网的应用程序。如果您之前订阅了有上限的数据计划，请确认您尚未用完分配给该计划的数据量。
互联网(Internet)计划通常有一个到期日期。如果您在有效期外访问互联网，则蜂窝数据将无法使用。如果当前计划过期，请检查您的数据计划状态并从您的移动运营商处购买新计划。
如果您需要帮助确认您的数据计划到期，请联系您的手机运营商或网络提供商。或者，如果您需要购买新的互联网计划。
3.使用飞行模式技巧
当您在设备上启用飞行模式(enable airplane mode)时，该功能会禁用所有蜂窝数据传输。同样，禁用飞行模式将重新激活所有蜂窝连接，并有望解决蜂窝数据问题。
打开 iPhone 的控制中心(Control Center)并点击飞机图标(airplane icon)以激活飞行模式。等待(Wait)5-10 秒，然后再次点击图标以禁用飞行模式。
或者，打开 iOS设置(Settings)应用并打开飞行模式(Airplane Mode)。等待(Wait)5-10 秒，然后将其关闭。
等待(Wait)您的 iPhone 加载蜂窝连接并确保蜂窝数据在“设置”(Settings)菜单中处于活动状态。如果蜂窝数据仍然无法正常工作，请继续执行下一个故障排除步骤。
4.检查时间和日期设置
如果您的 iPhone 的日期和时间设置不正确，则在使用某些应用程序和服务时，很有可能会出现与网络相关的故障。
打开设置(Settings)，选择常规(General)，选择日期和时间(Date & Time)，然后打开自动设置(Set Automatically)。
5. 禁用您的VPN 应用程序(VPN App)或连接
虚拟专用网 (VPN)(Virtual Private Networks (VPNs))有其优势，但有时也会出现问题。例如，VPN应用程序因减慢移动设备和计算机上的蜂窝和无线互联网连接而臭名昭著。在某些情况下，VPN应用程序可能会完全中断您设备的互联网访问。
如果您的 iPhone 上有一个活动的VPN连接，请将其关闭，然后检查您的设备现在是否可以访问互联网。启动您的VPN应用程序并关闭连接。
要在 iOS 中禁用手动VPN配置，请打开“设置”(Settings)应用并关闭VPN。
您还应该检查“设置”(Settings) > “常规(General)” > “ VPN 和设备管理(VPN & Device Management)” >“VPN”，并确保“状态”(Status)选项设置为“未连接”。
6.重启你的 iPhone
设备重启将刷新操作系统、蜂窝服务和蜂窝数据连接。
按住侧面按钮和任一音量按钮。之后(Afterward)，将幻灯片(slide to power off)向右拖动以关闭您的 iPhone。
或者，转到设置(Settings)>常规(General)>关机(Shut Down)，然后向右拖动幻灯片以关闭滑块(slide to power off slider)。
等待(Wait)一两分钟让您的 iPhone 完全关闭。之后(Afterward)，按住侧边按钮或电源按钮，直到Apple标志出现在屏幕上。如果您的 iPhone 蜂窝数据在重启后仍无法正常工作，请继续执行下一个故障排除解决方案。
7. 更新你的 iPhone
软件(Software)错误或编写不佳的 iOS 代码可能会导致 iPhone 和 iPad 出现与网络相关的故障。检查Apple 网站上的 iPhone 支持社区，(iPhone Support Community on Apple’s website)以确认其他运行类似 iOS 版本的用户是否遇到相同问题。
安装最新版本的 iOS 可以解决与网络相关的问题，尤其是在您很长时间没有更新 iPhone 的情况下。加入 Wi-Fi 连接并按照以下步骤安装 iOS 更新。
注意：(Note:) Apple强烈建议在安装软件更新之前备份您的 iPhone。您可以使用iCloud 备份通过(iCloud Backup)Wi-Fi执行此操作，或在 Mac 上创建备份(create a backup on your Mac)。
要更新您的 iPhone，请打开设置(Settings)应用程序，选择常规(General)，选择软件更新(Software Update)，然后安装页面上可用的任何更新。
如果您的 iPhone 具有最新的 iOS 版本，但蜂窝数据无法正常工作，请将操作系统回滚到之前的稳定版本。有关详细步骤，请参阅我们关于降级 iOS 的综合指南。(comprehensive guide on downgrading iOS)
8. 弹出并重新插入您的 SIM 卡(Your SIM Card)
损坏的SIM卡或SIM托盘可能会导致您的 iPhone 偶尔失去蜂窝网络接收和数据连接。使用旧的或过时的SIM卡也会产生类似的效果。
如果移动数据速度较慢(mobile data is slow)或您无法访问互联网，请取出您的SIM卡，然后将其重新插入SIM端口。确保SIM卡的金属触点/表面清洁，然后再将其重新插入手机。同样(Likewise)，请确保SIM卡正确放置在 iPhone 的SIM托盘中。
如果问题仍然存在，请联系您的运营商更换SIM卡，尤其是SIM卡使用时间超过 8-10 年时。
9.重置网络设置
这是一种有效的故障排除解决方案，可解决阻止Wi-Fi、蜂窝数据和其他网络相关进程正常工作的问题。网络重置会将 iPhone 的蜂窝网络设置恢复为默认设置。该操作还将重置您的 iPhone 名称、蓝牙(Bluetooth)设置、Wi-Fi网络和密码。
转到设置(Settings)>常规(General)>重置(Reset)>重置网络设置(Reset Network Settings)。输入您的 iPhone 密码，然后在确认提示中点击重置网络设置。(Reset Network Settings)
在 iOS 15 或更高版本中，前往设置(Settings)>通用(General)>传输或重置 iPhone(Transfer or Reset iPhone) >重置(Reset)并选择重置网络设置(Reset Network Settings)。输入您的 iPhone 密码，然后再次点击重置网络设置(Reset Network Settings)以继续。
等待(Wait)网络重置完成，然后检查手机数据现在是否可以在您的 iPhone 重新开机时正常工作。
10.重置所有设置
iOS 可以选择将 iPhone 的所有设置重置为默认设置，而不会删除您的文件或数据。该操作将重置“设置”(Settings)应用中的所有自定义设置——网络设置、位置和隐私设置、键盘配置等。
在运行 iOS 14 或更早版本的 iPhone 上，前往“设置”(Settings) > “通用(General)” > “重置(Reset)” > “重置所有设置”(Reset All Settings)，输入您的密码，然后选择“重置所有设置”(Reset All Settings)。
对于运行 iOS 15 或更高版本的设备，请前往“设置”(Settings) > “通用(General)” > “传输或重置 iPhone(Transfer or Reset iPhone) ” > “重置(Reset)” ，然后点击“重置所有设置”(Reset All Settings)。提供您的密码并选择重置所有设置(Reset All Settings)以开始重置操作。
当您的手机重新启动时，启用蜂窝数据并检查您是否可以访问互联网。
11. 执行 DFU 重置
在设备固件更新(Device Firmware Update)( DFU ) 模式下重置 iPhone可以解决其他故障排除步骤无法解决的严重问题。将DFU(Think)模式视为一种高级恢复环境，可将您的 iPhone 恢复出厂设置。(DFU)有关详细说明，请参阅我们在 iPhone 和 iPad(using DFU mode on iPhone and iPad)上使用 DFU 模式的教程。
注意：(Note:) DFU重置(DFU)将清除您设备上的所有内容或数据。因此，我们强烈建议您使用 iTunes（在 PC 上）或Finder（在 macOS 上）备份您的 iPhone 。(backup your iPhone)
联系 Apple 支持
如果您在尝试这些修复后仍然无法使用蜂窝数据网络，则问题可能与硬件有关。也许，你的 iPhone 的蜂窝天线有问题。在 Apple 网站上提交维修请求或(Submit a repair request)与 Apple 支持代表聊天，以(chat with an Apple Support representative)通过电话获得实时帮助。
iPhone Cellular Data Not Working? 11 Ways to Fix
These factors will affect сellular data connectivity on your iPhоne: poor network coverage or service outage, outdated operating system, bug-ridden system update, incorrect date & time settings, etc.
Problems with your SIM card could also birth cellular data issues. In this tutorial, we highlight 11 possible fixes to try if your iPhone won’t connect to the internet via cellular data.
1. Check Cellular Data Settings
If you have a mobile data plan but can’t surf the internet, check that your iPhone is configured to use cellular data. Open your iPhone’s Control Center, tap the antenna icon, and ensure it’s lit green.
Alternatively, go to Settings > Cellular (or Mobile Data) and toggle on Cellular Data (or Mobile Data). If already enabled, toggle off Cellular Data and turn it back on.
You should toggle off “Low Data Mode” if cellular data isn’t working for some apps or background processes. The feature reduces cellular data usage by disabling data-heavy background processes like automatic app updates, data synchronization & backup, etc.
In the Cellular Data (or Mobile Data) menu, select Cellular Data Options, and toggle off Low Data Mode.
Finally, ensure the “Voice & Data” option is set to either VoLTE or LTE—if your carrier doesn’t support VoLTE.
Toggle on Data Roaming if you have an international data plan and you’re out of your region or country. Contact your network provider for more information about your data plan.
2. Check Your Data Plan Status
You can’t access the internet or use internet-dependent apps on your iPhone without a data plan. If you previously subscribed to a capped data plan, confirm that you haven’t exhausted the data volume allotted to the plan.
Internet plans often have an expiration date. Cellular data won’t work if you’re accessing the internet outside the validity period. Check your data plan status and purchase a new plan from your cellular carrier if the current one expires.
Contact your cellular carrier or network provider if you need help confirming your data plan expiration. Or, if you need to purchase a new internet plan.
3. Use the Airplane Mode Trick
When you enable airplane mode on your device, the feature disables all cellular data transmission. Similarly, disabling airplane mode will reactivate all cellular connections and hopefully fix the cellular data problem.
Open your iPhone’s Control Center and tap the airplane icon to activate airplane mode. Wait for 5-10 seconds and tap the icon again to disable airplane mode.
Alternatively, open the iOS Settings app and toggle on Airplane Mode. Wait 5-10 seconds and toggle it back off.
Wait for your iPhone to load cellular connection and ensure cellular data is active in the Settings menu. Proceed to the next troubleshooting step if cellular data still isn’t working.
4. Check Time and Date Settings
There’s a high chance of experiencing network-related malfunctions–when using certain apps & services–if your iPhone’s date and time settings are incorrect.
Open Settings, select General, select Date & Time, and toggle on Set Automatically.
5. Disable Your VPN App or Connection
Virtual Private Networks (VPNs) have their benefits, but they’re sometimes problematic. For instance, VPN apps are notoriously infamous for slowing down cellular and wireless internet connections on mobile devices and computers. In some cases, VPN apps can totally disrupt your device’s internet access.
If there’s an active VPN connection on your iPhone, turn it off, and check if your device now has internet access. Launch your VPN app and shut down the connection.
To disable a manual VPN configuration in iOS, open the Settings app and toggle off VPN.
You should also check Settings > General > VPN & Device Management > VPN and make sure the Status option is set to “Not Connected.”
6. Reboot Your iPhone
A device restart will refresh the operating system, cellular service, and cellular data connection.
Press and hold the side button and either of the volume buttons. Afterward, drag the slide to power off slider to the right to shut down your iPhone.
Alternatively, go to Settings > General > Shut Down and drag the slide to power off slider to the right.
Wait for a minute or two for your iPhone to shut down completely. Afterward, press and hold the side button or power button until the Apple logo comes on the screen. Proceed to the next troubleshooting solution if your iPhone cellular data still isn’t working after the restart.
7. Update Your iPhone
Software bugs or poorly-written iOS code could birth network-related malfunctions in iPhone and iPad. Check the iPhone Support Community on Apple’s website to confirm if other users running similar iOS versions are experiencing the same issue.
Installing the latest version of iOS could fix network-related problems, especially if you haven’t updated your iPhone in a long time. Join a Wi-Fi connection and follow the steps below to install an iOS update.
Note: Apple strongly recommends backing up your iPhone before installing a software update. You can do that over Wi-Fi using iCloud Backup or create a backup on your Mac.
To update your iPhone, open the Settings app, select General, select Software Update, and install any update available on the page.
If your iPhone has the latest iOS version but cellular data isn’t working, roll back the operating system to the previous stable version. Refer to our comprehensive guide on downgrading iOS for detailed steps.
8. Eject and Re-Insert Your SIM Card
A damaged SIM card or SIM tray could cause your iPhone to occasionally lose cellular reception and data connection. Using old or outdated SIM cards could also yield similar effects.
If mobile data is slow or you can’t access the internet, remove your SIM card, and reinsert it in the SIM port. Ensure the SIM card’s metal contact/surface is clean before reinserting it in your phone. Likewise, make sure the SIM card sits correctly in your iPhone’s SIM tray.
Contact your carrier for a SIM card replacement if the problem persists–especially if the SIM card is over 8-10 years old.
9. Reset Network Settings
This is an effective troubleshooting solution for resolving issues preventing Wi-Fi, cellular data, and other network-dependent processes from working correctly. A network reset will revert your iPhone’s cellular settings to default. The operation will also reset your iPhone’s name, Bluetooth settings, Wi-Fi networks & passwords.
Go to Settings > General > Reset > Reset Network Settings. Enter your iPhone’s passcode and tap Reset Network Settings on the confirmation prompt.
In iOS 15 or newer, go to Settings > General > Transfer or Reset iPhone > Reset and select Reset Network Settings. Enter your iPhone’s passcode and tap Reset Network Settings again to proceed.
Wait for the network reset to complete and check if cellular data now works when your iPhone comes back on.
10. Reset All Settings
iOS has an option to reset all of your iPhone’s settings to their default without erasing your files or data. The operation will reset all customizations in the Settings app–network settings, location and privacy settings, keyboard configurations, etc.
On iPhones running iOS 14 or older, go to Settings > General > Reset > Reset All Settings, enter your passcode, and select Reset All Settings.
For devices running iOS 15 or newer, head to Settings > General > Transfer or Reset iPhone > Reset and tap Reset All Settings. Provide your passcode and select Reset All Settings to start the reset operation.
When your phone comes back on, enable cellular data and check if you can access the internet.
11. Perform a DFU Reset
Resetting your iPhone in Device Firmware Update (DFU) mode can fix serious issues other troubleshooting steps fail to resolve. Think of DFU mode as an advanced recovery environment that factory resets your iPhone. Refer to our tutorial on using DFU mode on iPhone and iPad for detailed instructions.
Note: A DFU reset will erase all content or data on your device. Therefore, we strongly advise that you backup your iPhone using iTunes (on PC) or Finder (in macOS).
Contact Apple Support
If you’re still having problems using cellular data networks after trying these fixes, the problem is likely hardware-related. Perhaps, your iPhone’s cellular antenna is faulty. Submit a repair request on Apple’s website or chat with an Apple Support representative to get real-time assistance via phone call.
