Are you sure its active? If yes.. First try to eject it, wipe it (Clean) and insert it back. If still not working it should be stuck in the network which means you have to call your provider and let them refresh the network.. Otherwise it needs to be replaced
if it is active , and you still see the network bar status shows bar indicating that your phone is connecting to the provider but even though you can't make calls then you have to go to Sim card manger and then chose your provider manually if it didn't solve your problem then definitely you have problem with your Sim card ,
to make sure about that follow the next step in my next comment
1st take out your Sim card and put it on other phone and see if the same problem remains or not if the other phone has successfully connected your cellular provider and able to make call then go back to your Samsung phone and head to setting then on the searching bar and type * Reset * them chose reset connection setting (Network reset)
make sure that you have inserted the sim card properly
try to reset the network settings from the device settings-general management-reset-reset the network settings
also from the device settings-connections-mobile networks-network operators -select automatically or manually
try to insert another sim card in the same device just to check if the problem from the device or from the sim card
We hope this has been of some assistance to you. If you do have any further queries, please do not hesitate to contact us. Hope you and your family staying healthy and safe!
