Feature phones PRL to indicate to a buyer whether on a home system, Network partner or a network ( roaming ). Phones with the capability of ERI when the proper software and PRL in them used by using a sign with the text on the screen, the home system or roaming . Since more phones can be distinguished by an icon and ... system, against the system, the roaming show . Phone, ERI also clearly can status the third " Network partner " to show that may contain a schedule and different.