The situation is now :
Guests use the self-registration and the get their password by SMS. Then they can log in.
But for one customer, there is no phone signal, so I would like that the guests use the self-registration, they can log in without to input the password and as soon as they have a signal, they receive the SMS with the password for the next connection.
I don't know if it's clear enough.
Thanks
Dimitri