SIM卡可能是我们手机中最重要的部分。没有它，我们将无法实现使用手机的真正目的，即拨打和接听电话。如果没有移动网络，我们也将无法连接到互联网。因此，当我们的Android智能手机无法检测到SIM卡时，这是非常令人沮丧的。
即使您的设备中插入了SIM 卡，您的设备上也可能会出现“无(SIM card)SIM卡”或“未检测到SIM卡”等错误消息。好吧(Well)，信不信由你，这是一个很常见的问题，很容易解决。在本文中，我们将通过一系列步骤来解决这个恼人的错误。如果前几个不起作用，不要失去希望；我们还有很多其他选择供您继续尝试。
修复 Android 上未检测到 SIM 卡错误(Fix No SIM Card Detected Error On Android)
1.重新启动您的设备(1. Reboot your Device)
这是解决Android上许多问题的简单而有效的解决方案，包括未检测到的SIM卡问题。只需(Simply)关闭您的设备并重新打开或使用重启选项。您需要做的就是长按电源按钮，直到出现电源菜单，然后点击重新启动按钮。手机重启后，检查问题是否已解决。
另请阅读：(Also Read:) 如何重新启动或重新启动您的 Android 手机？(How to Restart or Reboot Your Android Phone?)
2. 拆下电池并重新连接(2. Detach Battery and Re-attach)
这在大多数设备中是不可能的，因为电池是不可拆卸的。但是，如果您可以取出手机上的电池，那么您可以试试这个。只需(Simply)关闭设备并取出电池，然后将其放回原位。重新启动手机并检查SIM卡是否开始正常工作，您可以解决 Android 上未检测到 SIM 卡错误。(resolve No SIM card detected error on Android.)
3.调整你的SIM卡(3. Adjust Your SIM Card)
由于某种原因，SIM卡可能未对齐，并且由于这个原因，您的设备无法检测到该卡。解决方案非常简单，您只需将SIM卡从SIM卡托中取出并正确放回即可。您也可以用干布擦拭SIM卡，以去除触针上的灰尘颗粒。
如果您的设备较旧，那么由于磨损，SIM卡可能无法正确安装。您可以尝试使用一张纸或胶带确保SIM卡紧紧地插入插槽中。
4. Manual Select Mobile/Network Operator
通常，Android智能手机会自动检测SIM卡并连接到可用的最佳网络选项。但是，如果您遇到未检测到SIM / 网络的问题，您可以尝试手动选择一个。简单地做到这一点：
1. 进入手机设置(Settings)。
2. 选择无线和网络(Wireless and networks)。
3. 现在点击移动网络(Mobile Networks)。
4. 点击运营商选项(Carrier option)。
5.切换自动选项(Toggle the Automatic option)将其关闭。
6. 现在您的手机将开始搜索可用网络并显示您所在地区的网络列表。单击(Click)与您的运营商(Carrier)公司匹配的那个，然后选择可用的最佳速度（最好是 4G）。
5.更换SIM卡(5. Replace SIM Card)
现代智能手机缩小了SIM卡托盘的尺寸。这意味着您必须根据需要将标准尺寸的SIM卡缩小到 micro 或 nano。缩小尺寸的SIM 卡(SIM)去除了金板周围多余的塑料区域。手动切割SIM卡时，您可能以某种方式损坏了金板。这会导致SIM卡损坏且无法使用。在这种情况下，您所能做的就是获得一张新的SIM卡，然后将相同的号码移植到这张新卡上。
6.把SIM卡放到别人的手机里(6. Put the SIM card in someone else’s phone)
为了确保问题不在您的手机上，而是在您的SIM卡上，您可以将SIM卡放入其他手机中，看看是否被检测到。如果您在另一台设备上看到同样的问题，那么您的SIM卡已损坏，是时候换一张新的了。
另请阅读：(Also Read:) 修复 Gboard 在 Android 上不断崩溃(Fix Gboard keeps crashing on Android)
7.切换飞行模式(7. Toggle Airplane Mode)
另一个简单的解决方案是打开飞行模式，然后在短时间内再次将其关闭。它基本上重置了手机的整个网络接收中心。您的手机现在将自动搜索移动网络。这是一种简单的技术，在多种情况下都被证明非常有效。只需(Simply)从通知面板向下拖动即可访问快捷菜单，然后单击飞机符号。(click on the airplane symbol.)
8.联系客服(8. Contact Customer Service)
有时当SIM卡变旧时，它不再正常工作。有时，运营商公司本身会召回旧的SIM卡并停止支持。由于这个原因，您可能会面临“未检测到SIM卡错误”。(No SIM)该公司已自行关闭您SIM的活动网络连接。这种情况需要联系客服。您可以前往最近的运营商商店，向他们询问您的SIM 卡(SIM)。您可以在保持号码不变的情况下获得新的SIM 卡，传输(SIM)SIM卡上的数据，还可以继续使用现有的网络计划。
9.以安全模式运行设备(9. Run the device in Safe Mode)
问题可能是由于您在手机上安装了第三方应用程序。找出答案的唯一方法是在安全(Safe)模式下运行设备。在安全模式下，只允许运行内置的默认系统应用程序。如果您的设备能够在安全模式下检测到SIM 卡(SIM)，则意味着问题是由您在手机上安装的某些第三方应用程序引起的。为了在安全(Safe)模式下重新启动设备，请按照以下简单步骤操作。
1.按住电源按钮，直到您在屏幕上看到电源菜单(Press and hold the power button until you see the power menu on your screen)。
2. 现在继续按下电源按钮，直到您看到一个弹出窗口，要求您以安全模式重新启动。
3.点击(Click)确定，设备将重新启动并以安全模式重新启动(reboot and restart in safe mode)。
4. 现在检查您的手机是否检测到您的SIM卡。(SIM)
10. 在您的手机上执行恢复出厂设置(10. Perform a Factory Reset on your Phone)
如果上述所有方法都失败了，这是您可以尝试的最后手段。如果没有其他方法，您可以尝试将手机重置为出厂设置，看看是否可以解决问题。选择恢复出厂设置会删除您所有的应用程序、它们的数据以及其他数据，例如手机中的照片、视频和音乐。由于这个原因，建议您在恢复出厂设置之前创建备份。当您尝试将手机恢复出厂设置时，大多数手机都会提示您备份数据。您可以使用内置工具进行备份或手动进行备份，选择权在您手中。
1. 进入手机设置(Settings)。
2. 点击系统选项卡(System tab)。
3. 现在，如果您还没有备份您的数据，请点击备份(Backup)您的数据选项将您的数据保存在Google Drive上。
4. 之后单击重置选项卡(Reset tab)。
5. 现在点击重置电话选项(Reset Phone option)。
推荐：(Recommended: )如何解冻你的安卓手机(How to Unfreeze Your Android Phone)
这就是本故障排除指南的结尾，但我希望您现在能够 使用上面列出的方法修复Android上未检测到 SIM 卡错误。(Fix No SIM Card Detected Error)如果您有任何问题或建议，请随时在评论部分与我们联系。
Fix No SIM Card Detected Error On Android
A SIM сard is probably the most essential part of our mobile phones. Without it, we wouldn’t be able to fulfill thе νery purpose of using a mobile phone, that is to make and receive calls. We will also not be ablе to connеct to the intеrnet without a mobile network. Therefore, it is extremely frustrating when our Android smartphones are not able to dеtect a SIM card.
You might have experienced error messages like “No SIM card” or “SIM card not detected” on your device even if the SIM card is inserted in your device. Well, believe it or not, this is a quite common problem and can be easily solved. In this article, we will be going through a series of steps that you can take to fix this annoying error. Don’t lose hope if the first few don’t work; we have got plenty of other options left for you to keep trying.
Fix No SIM Card Detected Error On Android
1. Reboot your Device
This is a simple and effective solution to a lot of problems on Android including that of an undetected SIM card. Simply switch off your device and turn it back on again or use the reboot option. All that you need to do is long-press the power button until the power menu shows up and then tap on the reboot button. Once the phone restarts check whether the problem has been resolved or not.
Also Read: How to Restart or Reboot Your Android Phone?
2. Detach Battery and Re-attach
This is not possible in the majority of devices as the battery is undetachable. However, if you can remove the battery on your phone, then you can try this. Simply switch off your device and remove the battery and then place it back in. Restart your phone and check if the SIM card starts working properly and you’re able to resolve No SIM card detected error on Android.
3. Adjust Your SIM Card
It is possible that due to some reason the SIM card got misaligned and due to this reason, your device isn’t able to detect the card. The solution is really simple, you just need to remove your SIM card from the SIM tray and place it back in properly. You can also wipe your SIM card with a dry cloth to remove any dust particles on the contact pins.
If your device is old then due to wear and tear it is possible that the SIM card does not fit properly. You can try to use a piece of paper or tape to make sure that the SIM card fits tightly in the slot.
4. Manual Select Mobile/Network Operator
Usually, an Android smartphone automatically detects the SIM card and get connected to the best network option that is available. However, if you are facing the problem of an undetected SIM/network, you can try to manually select one. To do this simply:
1. Go to the Settings of your phone.
2. Select Wireless and networks.
3. Now click on Mobile Networks.
4. Tap on the Carrier option.
5. Toggle the Automatic option to switch it off.
6. Now your phone will begin searching for available networks and show you the list of networks in your area. Click on the one that matches your Carrier company and select the best speed available (preferably 4G).
5. Replace SIM Card
Modern smartphones have reduced the size of their SIM card tray. This means that you have to downsize your standard-sized SIM card to micro or nano depending on the requirement. A downsized SIM removes the extra plastic region around the gold plates. It is possible that while manually cutting the SIM card you have somehow damaged the gold plates. This results in the SIM card being damaged and unusable. In this case, all that you can do is get a new SIM card and then get the same number ported to this new card.
6. Put the SIM card in someone else’s phone
In order to make sure that the problem is not with your phone but with your SIM card, you can put the SIM card in some other phone and see if it gets detected. If you see the same problem on the other device, then your SIM card has been damaged and it is time to get a new one.
Also Read: Fix Gboard keeps crashing on Android
7. Toggle Airplane Mode
Another easy solution is to switch on the airplane plane mode and then turn it back off again in a short while. It basically resets the entire network reception center of your phone. Your phone will now automatically search for mobile networks. It is a simple technique that proves to be quite effective on multiple occasions. Simply drag down from the notification panel to access the quick menu and click on the airplane symbol.
8. Contact Customer Service
Sometimes when a SIM card gets old, it no longer works properly. At times the carrier company itself recalls old SIM cards and discontinues support. It is possible that you’re facing the “No SIM card detected error” due to this reason. The company has itself shut down active network connection for your SIM. In this situation, you need to contact customer service. You can go down to the nearest store for your carrier and ask them about your SIM. You can get a new SIM while keeping the same number, transfer the data on your SIM card, and also continue with the existing network plan.
9. Run the device in Safe Mode
It is possible that the problem could be due to a third-party app that you have installed on your phone. The only way to find out is by running the device in Safe mode. In safe mode, only the in-built default system apps are allowed to run. If your device is able to detect the SIM in safe mode then it means that the problem is being caused by some third-party app that you have installed on your phone. In order to restart the device in Safe mode, follow these simple steps.
1. Press and hold the power button until you see the power menu on your screen.
2. Now continue pressing the power button until you see a pop-up asking you to reboot in safe mode.
3. Click on okay and the device will reboot and restart in safe mode.
4. Now check if your SIM card is being detected by your phone.
10. Perform a Factory Reset on your Phone
This is the last resort that you can try if all of the above methods fail. If nothing else works, you can try to reset your phone to the factory settings and see if it resolves the problem. Opting for a factory reset would delete all your apps, their data, and also other data like photos, videos, and music from your phone. Due to this reason, it is advisable that you create a backup before going for a factory reset. Most phones prompt you to backup your data when you try to factory reset your phone. You can use the in-built tool for backing up or do it manually, the choice is yours.
1. Go to Settings of your phone.
2. Tap on the System tab.
3. Now if you haven’t already backed up your data, click on the Backup your data option to save your data on Google Drive.
4. After that click on the Reset tab.
5. Now click on the Reset Phone option.
Recommended: How to Unfreeze Your Android Phone
And that’s the end of this troubleshooting guide, but I hope by now you would be able to Fix No SIM Card Detected Error On Android using the above-listed methods. And if you have any questions or suggestions then feel free to reach out in the comment section.
