Hello, this is the nano sim 4FF

According to manual, it uses a mini-SIM, as full SIM is size of a credit card 😜. SIMs can be cut down or "glued" in place with a scotch tape, so nothing to worry.
@muller22 : media market product specs are not a reliable source of information... be aware and always back check with the manuals... 😜👍😊

Nano-SIM https://www.mediamarkt.at/de...

A mini sim slot.

Unfortunately, as I'm not the one who changed the SIM, I can't answer.
Sorry