Ng, Soo Sim writes:
Since the Hardphone is 'hard-coded', the phone can move round the vicinity of the redisential area and still able to make a call. Potentially this will lead to abuse, as someone may take the phone to a different location when owner is not around and make a 'free' call, return back the phone and the billing still charge the original subsriber.
with same logic, someone can take some else's cell phone, credit card, etc.. that is called stealing.
-- juha