My S8 is not working properly

[Shaqir]

My phone shows the notification that it doesn't have the sim card, but I have put it. To repair I restart my phone, but it shows again, and then I cannot call or use my 4G internet! Please can someone tell me what's happening with my phone and what should I need to do ?

Thanks a lot!

[strawberry cake]

Please turn off your phone, remove your SIM and clean it with a cloth then insert it back.

If persists, insert the SIM to another open network phone to test, if there's a signal the error is with the phone; if same no signal, contact your SIM network provider.