re: 'B' is too generous for the iphone 3G f

Not defending the iPhone here but:

"It also prevents Sat Nav devices from getting traffic updates. When I raised this with Apple support, they suggested using the iphone's built in sat nav but went quiet when I pointed out the illegality of using a phone while driving and the impracticallity of doing so on a motorbike."

You'll find that the interpretation of 'using a phone' means having it stuck to your ear. The simple expedient of using a hands-free set is legal, as is mounting it on your dashboard using any kind of freely available mounting device. The person on the other end of the phone was probably being extraordinarily polite.