Sessions and token

Hi all,

If I was to create a mobile app connecting to Michael Hartl’s tutorial ROR3 application... in order for me to implement a “always remember me” model, would a user just sign up once and get a token, and use that same token every time the mobile app runs. Or do I save the credentials and then log in behind the scenes every time the app opens, and then use a new token every app launch?

Thanks!