Yes, you can share an account with another person for free.
This shared account works just like a personal account. The only requirement to open a joint account is that both of you must have a personal account at bnc10.
Both of you will be able to manage your money shared from your mobile phone with the same bnc10 application and from your computer with the Webapp where you will have both accounts (personal and shared).
If you want to know what the steps are to open a shared account and learn more about it click here.