Indeed, the SIM card is not fixed. So, it broke the SIM connector pins of my phone because the edges (where the SIM card is inserted) Connector them hang ... So go easy by removing the phone! I may be a little too panicked when I saw that I could not remove it.
I think this kind of defect is not the fault of the brand, but the product itself. In all cases, it is better to have a suitable SIM card to the phone.