Selecting a Network
Your phone operates on specific networks and sometimes
it must choose which system to use. This can happen, for
example, if you are roaming (i.e. you leave the area where
you have signed up for service).
If you want your phone to work only in certain types of
networks (for example, to take advantage of certain billing
agreements between systems), you can specify this using
“Carrier Selection (Menu 5 1 1)”. See page 45.