hello, iphone user in brazil.

my old phone used to display the carrier name in big letters and just below the carrier city code in small letters, so I know if I am in my local area to make a local call or not. This is very good when travelling around the city where I live.

iphone only shows the carrier name right side of signal bars... any idea how can I get the other data my carrier is sending me, ie, carrier city code??

thanks!