Heh.
Firstly you're not going to be able to plug an Express card directly into an Amiga are you.
Besides, when you've finished adapting/regressing the Express card to the PCMCIA on an Amiga you'll still require drivers to "talk" with the device you're trying to use.
As regards to any 16 bit GSM pcmcia cards that are compatible with the Amiga you'll need to cross reference the available devices and drivers supported:
http://www.g-mb.de/pcmcia_e.html
