Function weighed 

fn weighed(limits: Option<&[Limits]>, sim: i32, chosen_kb: Option<u64>) -> Weigh

What a message may weigh by what the phone said (limits, none before it said): its carrier’s for sim (the conversation’s last; when it is unknown, -1, or the phone did not name it, the smallest of those that take multimedia messages), and no more than chosen here (chosen_kb, Settings ▸ Texts: 300 kB); with the carrier’s largest picture’s long side.