There are situations when the phone does not detect the SIM card.
Gazeta.ua will tell about several ways that can fix.
Restart your phone: Sometimes a simple restart can fix minor SIM problems.
Check your SIM card< /strong>: Make sure the SIM card is inserted correctly. It must be inserted into the SIM card slot of your phone. Make sure the contact points on the SIM card are clean and undamaged.
Check your network settings: Make sure your phone is set to the correct network. This can be done in your phone's settings under Network & Connections.
Try a different SIM card: If you have access to a different SIM card, try inserting it into your phone to determine if the problem is with the SIM card or the phone itself.
Software update: Make sure your phone has the latest software version. Sometimes device problems can be solved by updating.
Contact the manufacturer or service center: If none of these methods help, you may need to contact the phone manufacturer or authorized service center for further diagnosis and repair.