Reading/writing to a SIM card requires a hardware capability that used to exist in the first generations of smartphones (when people were migrating from dumb- and feature-phones to smartphones and cloud contacts storage), but has been taken away (as a cost-saving measure, I guess) for several years now (very quietly).
So I you really need to update your SIM card contacts, you best bet IMO is to :
- Get an old device. I’m talking Android 4-era.
- Use Dumbphone Assisant, as @trefix advised.
BTW, should you need such a device, I have a Samsung Pocket 2 for sale. ^^
EDIT :
Dumbphone Assistant is actually based on a work dating back to 2010, at the time of Android 2…