Fix: Samsung A03, A03S, and A03 Core No SIM Card Detected Error

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

Fix 2: Perform a Soft Reset

A soft reset (Force restart) is more effective than a normal reboot. The No Sim Card Detection Error on your Samsung Galaxy A03, A03S, and A03 Core could result from a 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 and volume down (-) buttons for a few seconds. Release your fingers from the buttons once the Samsung logo appears on the screen. Let the device reboot, 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 find 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 to be unable 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 your Samsung Galaxy A03, A03S, and A03 Core, 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 often works with software-related issues, including the No Sim Card Detected issue on your Samsung Galaxy A03, A03S, and A03 Core.

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 A03, A03S, and A03 Core, navigate to Settings > General Management > Reset > Factory Data Reset. After that, the device will take a few minutes to complete. Ensure that the device has at least 50% battery, as the process can sometimes take longer.

We believe that one of the methods would have helped you fix the issue on your Samsung Galaxy A03, A03S, and A03 Core. In the comments below, let us know which method did the trick.