Fix: Samsung Galaxy S21 FE 5G No SIM Card Detected Error

Having mid-range or higher-end phones like Samsung does not guarantee that the devices will not fall victim to any issues. The devices have faced issues in the past, and one of the most common problems is the No Sim Card Detected error. Whether the device is not detecting a sim card or throwing errors like No Service or No signal detected, we’ve listed some fixes to eliminate those issues.

In most cases, the sim card-related errors like No Sim Card Detected, No Service, etc., can be easily fixed. But, sometimes, the problem occurs when the sim card is damaged or there’s some network issue in your area. In any case, it’s worth applying the fixes that we have listed below.

Fix: Samsung Galaxy S21 FE 5G No SIM Card Detected Error

Here’s what to do if your Samsung Galaxy S21 FE 5G is not detecting SIM card

Fix 1: Turn Airplane Mode on and off

Whenever you face any sim card or network-related issues, you should first turn on the Airplane Mode and then turn it off. This method does the trick most of the time. This method disconnects your device from the wireless system until the option is not turned on.

To turn on the Airplane Mode, Navigate to Settings > Connections > Airplane Mode and then tap on the toggle next to the Airplane Mode. Alternatively, you can turn on the feature from the Quick Settings.

Fix 2: Perform a soft reset

Soft reset (also called Force restart) is more effective than performing a normal reboot. The No Sim Card Detection Error on your Samsung Galaxy S21 FE 5G could result from a system glitch. Performing a soft reset ends all the running processes, including those responsible for system glitches, which can fix all the sim card or network problems.

To perform a soft reset on your Samsung Galaxy phone, press and hold the power button and volume down (-) button for a few seconds. Release your fingers from the buttons once the Samsung logo appears on the screen. Let the device reboot itself, and check if the sim card issue persists.

Fix 3: Remove and re-insert the sim card

Your phone can throw errors such as No Sim Card Detected when the sim card is damaged or misplaced in the sim tray. To rule out this possibility, open the sim tray and check if the sim card is placed as it should be. Also, check for any damage on the card. If you found any damage on the sim card, replace it by going to the respective carrier’s store. Otherwise, move on to the following method.

Fix 4: Reset network settings

Some changes in the network settings might have caused the device not to be able to detect a sim card. Thankfully, Samsung offers an easy way to reset all the changes. By resettings network settings, you will lose access to Wi-Fi passwords, paired devices, etc.

To reset network settings on your Samsung Galaxy S21 FE 5G, go to Settings > General management > Reset > Reset network settings > Tap on Reset settings.

Fix 5: Factory reset

If none of the methods has worked for you, we are left with the factory reset option. This method works most of the time with software-related issues, including the No Sim Card Detected issue on your Samsung Galaxy S21 FE 5G.

By performing a factory reset on your phone, you will lose access to all your data. Therefore, take a complete backup of your phone before using this method. To factory reset your Samsung Galaxy S21 FE 5G, navigate to Settings > General Management > Reset > Factory Data Reset. After that, the device will take a couple of minutes to complete the process. Ensure that the device has at least 50% battery, as the process can sometimes take longer than usual.

We believe that one of the methods would have helped you fix the issue on your Samsung Galaxy S21 FE 5G. Let us know which method did the trick for you in the comments below.


  1. I’ve tried all of the recommendations, as well as checking the sim card I’m another device, which sim card still working. Please help.

    1. I too have the same problem. Been without the phone use for 2 weeks, firstly attacking my network provider, having 3 sim replacements later… sim is working in other phones what’s the process now SAMSUN!?!

  2. My Galaxy S21 would tell me there was “No SIM” a couple times every day. Restarting the phone was the only way to get it to “find” the SIM card. I tried most of the fixes on this list, and nothing worked. I tried a new SIM card, and that did not help either. Finally, I ask T-Mobile to switch me to the eSIM. That fixed the problem.

  3. I have an unlocked Samsung Galaxy S21 on T-Mobile. The phone kept telling me No SIM, especially when I drove to a different location. If I restarted the phone, it would “find” the SIM again. I got T-Mobile to switch me to an eSIM, and now the phone works fine.

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