Function replace 

pub(crate) fn replace(
    qt: &CxxQtThread<Sioul>,
    shared: &Arc<Shared>,
    id: &str,
    yes: bool,
) -> String

The answer: yes, this phone’s entry says it replaces that one (sealed, for every device: devices::Entry::replaces), forgotten here at once, and an exchange tells the others; no, a second phone, nothing changes. Asked once either way. Nothing of the other phone is deleted.