So I have two iPhones, a first gen unit that I jailbreak and play around with, then my normal iPhone 3gs. Is it possible somehow to install MiWi onto a non jailbroken phone, by resigning the binary with a valid developer certificate? I've heard of this trick being used before, but I was curious if anyone here has gotten it working for MyWi in particular.

Having MiWi on the 3GS would be much more useful, as it's the phone I keep a data plan on. The old iPhone is WiFi only these days, with a prepaid T-Mobile SIM as a backup.