Restarting is always a good fallback, but before you get to that point, there are other steps you can take if you're off the ...

1. Check SIM Card Insertion Begin by ensuring that the SIM card is correctly inserted into the device. Power Off the Device: Turn off your Samsung Galaxy before handling the SIM card.

Select SIM card manager. Choose your SIM (If you only have a physical SIM, it'll just be the only one listed). Tap Convert to eSIM. Follow the on-screen instructions and then you're done.

Users can reactivate their expired SIM cards independently online or by visiting the nearest mobile operator's office.

Remove the SIM ejector tool from the SIM kit and push it into the tray hole. The tray pops out. Remove the SIM card from its packaging and place it on the tray.