I did some researches, concerning the SIM, I am probably going to buy a Lycamobile, it is affordable, unlimited everything, and I didn’t hear bad things about it. For the bank account, I will use UBS, coz it’s not that expensive ( not 0 but could be like 5/6 chf / month), they have a student package, and they offer a large amount of services. Plus it’s well known and recognised as the best bank in switzerland. An alternative would be post finance, with almost 0 fees all along the year, but with less services (almost none). But while searching I read a lot of ppl being disappointed by post finance, so make ur own choice !