Hi,
I've put together a small program that puts Nokia 3310 phones into
debug mode (via serial/USB cable) and forwards all sent/received GSM
messages and SIM APDUs via GSMTAP to be viewed realtime in Wireshark.
This allows you to see the message flows for a real phone on a real
network.
Nokia 3310's are very cheap and easy to come by, so should appeal to a
wide audience.
Thought osmocom might be a good home for this utility - could it go
into git, and a short page on bb.osmocom.org?
Duncan