Wow, great work! My old cell phone (LG CU515) has a USB modem profile but I could never get it working because I didn't know the modem init string. I'll definitely give this a try when I get a new SIM card.
How's the speed? Does it feel like dial-up, or faster? For big box Amigas, this could also be a workaround for the shortage of network and USB cards...
