Jetstar has offered SMS check-in using any phone since last May, but I only got to try it for the first time yesterday. In line with my long-established ability to render almost any technology inoperable, it didn't work.
I received the text message, but the reader at the gate simply couldn't recognise it. After a couple of attempts, the flight attendant gave up and typed in my sequence number instead. That didn't take very long so there was no major hold-up, but if the experience was widely repeated, it would definitely slow things down.
Anyway, I'm wondering: how have you found the SMS check-in experience? Is what happened to me a weird one-off, or is the system glitchy? Tell us in the comments?