In most of the world, the caller used to pay (or maybe still pays in some places?) extra for calling a mobile number. This is easy to arrange and clear to the c

In most of the world, the caller used to pay (or maybe still pays in some places?) extra for calling a mobile number. This is easy to arrange and clear to the caller since mobile numbers are in a separate area code range. As I understand, in the US mobile numbers use the same area codes as fixed numbers, so this isn't possible. Receiving a call on a fixed number in the US is still free, I suppose?