You are right, the one I looked at (cheap £20) does not do airbags.
I'm looking at the Carista website, understand you purchase the obdii device, but then it sounds like the App is a recurring subscription...which is quite costly if your paying every month. Is this what you use, or did you find an alternative App with one off cost instead of subscription?
Thanks for any info!
EDIT: Just found another thread discussing this topic, confirms there is a two week free period, then option in future to buy 1 month at £9.99. Only question now is whether its compatible with my T5.1 2015.