I have to give away one of my SIM cards and wondering is there a way to remove contacts from it? Sincerely I’m not even sure if I have some contacts on the SIM card, but I would like to clean the SIM before giving it away.
I too would like to know how to delete some numbers from the SIM. Sailfish does not allow you to do this on the SIM but only on the mobile phone contacts if the number is not connected to the SIM
Put the SIM in a old-style phone (maybe borrowed) and delete the contacts
Use a SIM-card reader and its software to delete from the PC. There are plenty of them for sale online.
This can probably be of some inspiration:
Natively you can’t delete them