Cannot phone/message my SIM-imported contacts

Hi and welcome to the forum.

First: Did you insert an SD card and format it as internal storage if you did reformat it as external/portable,

Querying your procedure.

  1. Under Contacts app you have the hamburger option top left > Settings > then Manage contacts you have > Import then the choices are .vcf or SIM, so which did you use? I see no option for ‘app list