Can you try the Smart SIM card on the SIM 1 slot? If it doesn't work, then that SIM card might be faulty. Replace the SIM card. If it works, then the SIM 2 slot of your phone is damaged. Bring it to a Samsung Service Center to have it checked. Also, can you try that SIM card on another device?
Before you try out the recommendations below, be sure to check ifyour device's software and related apps are updated to the latest version. To update your mobile device's software, follow these steps:
Step 1.Go toSettings> Software update.
Step 2.Tap on Download and install.
Step 3.Follow the on-screen instructions.
Step 4.Restart your device.
Check and inspect the SIM.
Check 1.Restart your phone and see if that fixes your problem as it often resolves many minor glitches.
Method 1.Press and hold the 'Volume Down' and 'Power' buttons at the same time for at least 7 seconds. Your device should restart after this.
Method 2. Using two fingers, swipe down from the top of the screen to open the Quick settings panel. Tap the 'Power' icon, and then tap 'Restart'. Tap 'Restart' again to confirm.
Check 2. Inspect the SIM card
Turn off your phone by pressing the Power buttonand take out the SIM card from the SIM card tray. Check for any visible signs of damage like scratches or stains. Clean the SIM card and tray with a clean, dry cloth. Reinsert the SIM card, making sure it is properly installed in the tray.
Once everything is secured back into place, turn your phone on again and see if the error is gone.
Check 3. Reset network settings
This usually happens after modifying your phone settings and manually switching menu options. Please note that resetting network settings will also reset Wi-Fi, Bluetooth, and other network settings so make sure you take note of this information beforehand.
Step 1. Open Settings and tap General management.
Step 2. Tap Reset.
Step 3. Tap Reset network settings.
Step 4. Check the information on the screen and tap Reset settings.
Step 5. Tap Reset.
Check 4. Test if the SIM is still working
Insert the SIM card into another phone and see if it gets detected. If the SIM card is also not detected by another phone, then the SIM card is already damaged. We recommended contacting your service provider for assistance and replacing your SIM card with a new one.
However, if it works with other devices, the problem could be with your phone. In this case, please request service by locating the Samsung Authorized Service Center nearest you.
