Saving contacts to SIM / view SIM contacts
I cannot specifically tell with your device, as I've never used it, but I can surely tell on Samsung Galaxy Edge 7, which runs on Nougat.

There, this option available under More options in Contacts, as per this video.

It may have been possible that your manufacturer has developed the User Interface in such a way that this is not supported, but Nougat OS clearly supports it.