Problem Nokia phonebook


Hello. I bought 2 Nokia 2.1 phones with Android Oreo. The problem with phones is: when I access the phonebook, no number appears. The numbers are stored on the sim. Initially I thought it was a problem with the sim but I tried with another one on another network and the same problem. If I want to save a phone number, I have only 2 options: the gmail account or the gadget (ie the phone), on I don't have the option to save the sim. The sim works otherwise, I can make calls, the first calls, I can go online but I can't access the phone numbers in the sim. Can someone help me in this regard?