Kindly try the below steps "1.Restart your phone and see if that fixes your problem as it often resolves many minor glitches. 2.Inspect the SIM card 3. Reset network settings( Open Settings and tap General management. Tap Reset network settings.) 4.Test if the SIM is still working . If the above steps did not resolve the issue, please visit your nearest Samsung Authorized Service Center: https://www.samsung.com/ae/support/service-center/.
