Almost all people in France over 18 years old have a bank account. It is necessary, even essential, for some common operations ...
In France, the registration, insurance and rent payments are made by cheque (sometimes credit card), but not in cash.
Therefore, opening a bank account is strongly recommended.
Two banks are partners with ENSIACET students:
Some banks have partnerships with additional health security companies ("mutuelles") and can be a warrant for your accommodation ("caution solidaire"). Great service !