The Sim Holder is simple to replace (you have to break it in pieces gently to not break the 8 solder points in the two sides, and with 6 Euro you have a new Sim Holder, and the box will be like new.

Sim Holder : https://jam3.japhar.com/japhar/index.php/product/sim-socket/

Yes, the replacement of the sim is very simple, as a mobile phone. Naturally you have to gently open the sim holder. If you broke it it's possible to block it once you have the sim inside or better replace the sim holder/socket as it's only a 6 Euro part.

Japhar Sim : https://jam3.japhar.com/japhar/index.php/product/japhar-dm800se/

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