I’ve always wanted to play around with raw SMS PDUs. You could construct MMSes “from scratch”, for example; or send “ephemeral alert” messages that (at least by the standard) don’t get stored in SMS conversation history, just popping up and then disappearing instead.

Does anyone know, then, why Twilio and its like don’t let you construct/send raw binary PDUs? If it was a matter of cellular network security, well, that was already out the window once you let people with rooted phones into the network. Why not give virtual “phones” the same capability?