The reason I chose blackberry is because blackberry sim cards come with 3G flat-rate plans.
Would cutting a blackberry's sim card into a microsim card work? The iPhone 4 is unlocked and hasn't been activated yet.
The Japanese cellphone companies like Softbank are unwilling to provide a simcard for a device that is not their's. That's why all this trickery is necessary...
Would this plan have a chance of working?