Hi the z2 has a quick boot option in the dev settings . I have the note 3 galaxy s5 and the z2 currently for business reasons . However I have very annoyed at the z2 . It has a very dim screen and seems very laggy and slow . Are you haveing any of those issues ? and I like the style of the z2 apart from the magnetic left hand side thing as it really gets annoying when im holding it and accidentally run my finger over it .