US system
An advantage of the US system is that your mobile gets a regular local number, so there is no need for a landline phone.
Sending and receiving calls in your local area is generally free in the monthly subscription. But you get to pay roaming charges - so if someone calls you while you are in another city you pay long distance rates to listen to them!
Still it should be allowed - it's upto the market to decide which pricing system works, there is no reason why one should be banned just because the US thought of it.