Not sure, maybe your SMS client has a way of encoding it somewhere in the metadata, and if the recipient uses the same client, it does show up like that? The SM

Not sure, maybe your SMS client has a way of encoding it somewhere in the metadata, and if the recipient uses the same client, it does show up like that? The SMS 'protocol' (if it's called that) doesn't have it, AFAIK, and no SMS I ever used had such functionality.