如果您的三星(Samsung)或其他Android设备出现“无效 SIM 卡”错误，您可能会遇到糟糕的一天，无法拨打电话或访问互联网。
然而，在您开始考虑订购新的SIM（用户身份模块(Subscriber Identity Module)）卡或（但愿不会）开始购买新手机之前，请注意，此错误通常是软件故障而不是硬件问题的结果。至少这是个好消息！
1. 重新启动您的 Android 手机
当您的Android(Android)设备上遇到此错误时，第一道防线是简单的重新启动。关闭电源并重新启动通常可以清除导致此错误和其他类似错误的小故障。
在大多数情况下，只需按住手机的电源按钮直到出现重新启动选项，然后选择它即可。但是，如何关闭或重新启动手机的具体细节可能会因您的 Android 版本或手机型号而异。
如果您需要有关如何继续操作的帮助，请查看如何关闭 Android 手机(How to Turn Off Your Android Phone)，您将了解比您需要或想知道的更多关闭手机的方法。不客气！
2. 打开和关闭飞行模式
飞行模式是一种用于关闭和打开(Airplane mode)Wi-Fi、蓝牙(Bluetooth)和移动服务的一键式解决方案。顾名思义，它旨在让您轻松遵守航空公司(Airline)有关无线电信号的规定，但它也成为了一个出色的故障排除工具。
有时，切换飞行模式可以解决与网络相关的问题。导航(Navigate)至手机的设置菜单并打开飞行模式(Airplane Mode)。通常，您可以通过滑动手机屏幕顶部的阴影并点击飞机图标来
访问飞行模式。(Airplane Mode)
请(Please)稍等片刻，然后重新关闭。这可以让您的移动网络进行一次小型“重启”，从而可以修复较小的连接问题。
3.取出(Remove)并重新插入 SIM 卡(Reinsert Your SIM Card)
解决SIM卡问题的快速方法是将(SIM)SIM卡从Android手机中取出并重新插入。
关闭手机电源，打开后盖，轻轻滑出SIM卡托。检查手机的SIM卡及其插槽是否有任何明显的损坏。如果一切正常，请重新插入设备的SIM卡和电源。
许多较新的手机不再具有可拆卸的后盖，并且需要使用SIM弹出工具弹出(SIM)SIM托盘来访问SIM卡。您的手机中应该包含一个，但如果您丢失了它，可以在网上或从手机商店购买，价格相当便宜。您可以在紧要关头使用回形针或其他钝金属针，但如果不小心，可能会损坏手机。
4. 正确的网络模式
“无效SIM卡”错误的另一个常见原因可能是您的Android手机设置为错误的网络模式。大多数手机提供GSM、LTE或自动选项。选择错误可能会导致SIM 卡(SIM)无效错误。
要纠正此问题，请转到设置菜单，选择Mobile Networks/Connections（或类似的），然后选择网络(Network)模式，最后为您的网络提供商选择正确的选项。
如果您在其他国家/地区漫游，您的手机可能不支持本地网络模式。有时需要购买当地的SIM卡来临时使用。(SIM)将旧卡存放在拉链袋中，以免丢失。漫游费用可能很高，因此使用本地SIM 卡(SIM)是有意义的，这只会影响您的电话号码和短信。Telegram或Whatsapp等基于数据的应用程序使用互联网数据而不是蜂窝呼叫服务。
5. 手动网络选择
如果您的手机难以自动连接到正确的网络，手动选择网络运营商可以解决该问题。
在“移动网络”(Mobile Networks)下，选择“网络(Network) 运营商(Operators)” ，然后选择“搜索网络”(Search Networks)或取消选中“自动选择”(Select Automatically)，这将初始化搜索。
一旦出现可用网络，请选择正确的网络。请记住，Android版本和手机品牌之间的菜单位置和名称有所不同，因此您可能需要临时调整一下。
6. 重置网络设置
另一个可能的解决方案是重置网络设置。此操作不会删除您的数据，但会删除所有Wi-Fi、蓝牙(Bluetooth)和蜂窝网络设置，包括您保存的网络和密码。
虽然必须再次输入所有这些密码很痛苦，但这可能是必要的，而且最终，这是一个无害的修复。确保您知道关键网络（例如工作Wi-Fi）的密码或连接设置。
导航(Navigate)到Settings > System > Reset > Reset网络设置，然后确认您的选择。在我们的三星 S22 Ultra(Samsung S22 Ultra)测试设备上，此设置位于System > General Management下。
7. 将设备启动到安全模式
通过将 Android 设备启动到安全模式，您可以确定第三方应用程序是否可能导致您的SIM卡出现问题。
在安全模式下，所有第三方应用程序均被禁用。如果您的SIM卡在此模式下正常工作，则罪魁祸首很可能是某个应用程序。然后，您可以删除最近安装的应用程序以查找有问题的应用程序。
有关详细说明，请参阅如何以安全模式启动 Android 手机(How to Start Your Android Phone in Safe Mode)。
8.清除手机缓存
如果您使用Android设备一段时间，它就会积累大量缓存。这些临时文件有时会干扰系统操作，导致诸如“无效 SIM 卡”之类的错误。
清除手机缓存的具体步骤可能因手机而异，但有关如何完成此操作的示例，请参阅如何清除三星手机上的缓存(How to Clear Cache on Samsung Phones)。
9. 将手机恢复出厂设置
作为最后的手段，请考虑恢复出厂设置。仅应在备份所有重要数据后执行此步骤，因为它会擦除设备上的所有内容并将其恢复为原始设置。
在继续之前，请确保您的数据已安全备份到Google Drive、iCloud 或外部存储设备等云服务上。
请阅读如何硬重置冻结的 Apple iPhone 或 Android 设备，(How To Hard Reset a Frozen Apple iPhone or Android Device)了解有关将Android手机恢复出厂设置的详细说明和信息。
10.购买新的SIM卡
如果没有任何效果，并且您的SIM卡无法在另一台设备上使用，则您应该购买一张新卡。SIM卡通常只需几美分，只需拨打一个电话（显然是在另一部手机上）或访问您的网络提供商，您就可以将您的移动帐户移植到新的SIM 卡(SIM)上。
如果您拥有带有嵌入式 e SIM(SIM)的新型手机，您也许可以完全放弃物理SIM卡。请联系您的服务提供商并询问他们的网络是否支持 e SIM S。(SIM)如果他们这样做，请按照他们的指示进行操作。
如果其他一切都失败怎么办？
有时，尽管您尽了最大努力，“无效 SIM 卡”错误仍然需要修复。在这种情况下，值得检查您的设备是否处于网络锁定状态或者您的IMEI(IMEI)（国际移动设备识别码(International Mobile Equipment Identity)）是否存在问题。
How to Fix the “Invalid SIM Card” Error on Android
Іf your Samѕung or other Android device hits you with an “Invalid SIM Card” error, you’re prоbably having a bad day, unable to make calls or access the internet.
However, before you start thinking about ordering a new SIM (Subscriber Identity Module) card or — heaven forbid — begin shopping for a new mobile phone, know that this error is more often than not a result of software glitches rather than a hardware problem. That’s some good news, at least!
1. Reboot Your Android Phone
When confronted with this error on your Android device, the first line of defense is a simple reboot. Powering off and restarting can often clear minor glitches that cause this and other similar errors.
In most cases, it’s as simple as pressing and holding your phone’s power button until the reboot option appears, then selecting it. However, the exact details of how to power off or restart your phone can vary based on your Android version or phone model.
If you need help with how to proceed, check out How to Turn Off Your Android Phone, and you’ll know more ways to shut your phone down than you need or ever wanted to know. You’re welcome!
2. Turn Airplane Mode On and Off
Airplane mode is a one-touch solution for turning Wi-Fi, Bluetooth, and mobile services off and on. As the name suggests, it’s meant to make it easy to comply with Airline regulations around radio signals, but it’s also become a great troubleshooting tool.
Sometimes, toggling the airplane mode can resolve network-related issues. Navigate to your phone’s settings menu and turn on Airplane Mode. You can usually access Airplane Mode by swiping the shade from the top of the phone’s screen and tapping the airplane icon.
Please wait a few moments, then switch it back off. This gives your mobile network a mini “reboot,” which can fix minor connectivity issues.
3. Remove and Reinsert Your SIM Card
A quick way to solve the SIM card problem is to remove the SIM card from your Android phone and reinsert it.
Power off your phone, open the back cover, and gently slide out the SIM card tray. Inspect your phone’s SIM card and its slot for any visible damage. If everything seems fine, reinsert your device’s SIM card and power.
Many newer phones no longer have a removable back, and the SIM card is accessed by ejecting a SIM tray using a SIM ejection tool. One should have been included with your phone, but if you’ve lost it, they are pretty cheap to buy online or from a mobile phone store. You can use a paperclip or other blunt metal pin in a pinch, but you risk damaging your phone if you’re not careful.
4. Correct Network Mode
Another common cause of the ‘Invalid SIM card’ error could be that your Android phone is set to the wrong network mode. Most phones offer GSM, LTE, or automatic options. Choosing the wrong one could lead to an invalid SIM error.
To rectify this, head to your settings menu, select Mobile Networks/Connections (or similar), then Network mode, and finally, pick the right option for your network provider.
If you’re roaming in another country, your phone may not support the local network mode. Sometimes, buying a local SIM card is necessary to use temporarily. Keep your old card in a zip lock bag to avoid losing it. Roaming charges can be steep, so it makes sense to use a local SIM, which will only affect your phone number and text messages. Data-based apps like Telegram or Whatsapp use internet data rather than cellular calling services.
5. Manual Network Selection
If your phone struggles to connect to the correct network automatically, manually choosing your network operator can clear up the issue.
Under Mobile Networks, select Network Operators, then Search Networks or uncheck Select Automatically, which will initialize a search.
Once the available networks appear, choose the correct one. Remember that menu locations and names differ between Android versions and phone brands, so you may have to improvise a little.
6. Reset Network Settings
Another potential solution is to reset your network settings. This action won’t delete your data but will remove any Wi-Fi, Bluetooth, and cellular network settings, including your saved networks and passwords.
While it’s a pain to have to enter all those passwords again, it may be necessary, and ultimately, this is a harmless fix. Ensure you know the passwords or connection settings for critical networks, such as your work Wi-Fi.
Navigate to Settings > System > Reset > Reset network settings, and confirm your choice. On our Samsung S22 Ultra test device, this setting was under System > General Management.
7. Boot Your Device Into Safe Mode
By booting your Android device into safe mode, you can determine if a third-party app might be causing your SIM card issue.
In safe mode, all third-party apps are disabled. If your SIM card works correctly in this mode, an app is likely the culprit. You can then remove recently installed apps to find the problem app.
For detailed instructions, head over to How to Start Your Android Phone in Safe Mode.
8. Clear Your Phone’s Cache
If you’ve used your Android device for a while, it’s accumulated a substantial cache. These temporary files can sometimes interfere with system operations, causing errors like the ‘Invalid SIM Card’ one.
The exact steps to clear your phone’s cache may differ from one handset to the next, but for an example of how it’s done, look at How to Clear Cache on Samsung Phones.
9. Factory Reset Your Phone
As a last resort, consider a factory reset. This step should only be taken after backing up all your essential data, as it will erase everything on your device and return it to its original settings.
Before proceeding, ensure your data is safely backed up on a cloud service like Google Drive, iCloud, or an external storage device.
Read How To Hard Reset a Frozen Apple iPhone or Android Device for detailed instructions and information on factory resetting your Android phone.
10. Buy a New SIM Card
If nothing has worked, and your SIM card fails to work on another device, you should buy a new one. SIM cards are only a few cents usually, and with a phone call (on another phone, obviously) or a visit to your network provider, you can have your mobile account ported to your new SIM.
If you have a newer handset with an embedded eSIM, you might be able to ditch physical SIM cards altogether. Contact your service provider and ask them if they support eSIMS on their network. If they do, follow their instructions.
And What If All Else Fails?
Sometimes, despite your best efforts, the ‘Invalid SIM Card’ error still needs to be fixed. In such instances, it’s worth checking if your device is under a network lock or has an issue with your IMEI (International Mobile Equipment Identity).
