I would argue that it's your phone that is in the wrong. The dialer should know that a `?` is not a valid DTMF tone, and strip all invalid characters. There ar

I would argue that it's your phone that is in the wrong. The dialer should know that a `?` is not a valid DTMF tone, and strip all invalid characters. There are plenty of use-cases where having tracking metadata is useful. I can't think of a single one where having a dialer interpret a `?` is.