Both Message-ID spoofing/reuse and dressing up the message body to look like it was coming from a mobile device would probably rank the spam's quality lower tha

Both Message-ID spoofing/reuse and dressing up the message body to look like it was coming from a mobile device would probably rank the spam's quality lower than otherwise. Occam's razor argues that this genuinely did come from an Android OS, and statistics argues that this is a smartphone. It isn't certain fire, but this is definitely smoke. And it is terrible news for carriers and customers alike.