Nokia 638 - Manual (Page 29)

System Select (Menu 2)
Note: When the menu function SID SCREEN has
been set to SID SCRN ON and you try to access
this menu function, the message
NOT ALLOWED
is briefly displayed and the phone exits the menu
facility.
This menu function allows you to select a roaming
option. Roaming is a feature which is relevant in
areas where there are two cellular service providers
operating in your area. Your phone is designed to
work with either or both service provider networks.
Roaming, when available, allows you to register your
phone on more than one network. This system prior-
ity feature allows you to program your phone for opti-
mum operation when within your home service area
or when outside your home service area.
Contact your cellular service provider for informa-
tion about roaming agreements they have with
other cellular service providers.
In some areas roaming phones are automatically
recognized by the cellular system’s computer. In
other areas, you must contact the service provider
before it can recognize your phone. The operator
needs to know your phone number, your phone’s
ESN (electronic serial number), and how you plan
to pay for your calls. There is normally an addi-
tional charge for roaming calls.
Note: The ESN of your phone is located under the
battery of the phone. (However, the ESN of your
phone can normally be read over the air by the
roaming cellular service providers when you call
them to register your roaming presence on their
cellular network.
NHA-4NG Nokia 638_AU
Authentication version
US English 9351137
Issue 3
Version: 0.7, Date: 11 (2) Dec.
1996
Status: ToL, JaK, JaG, SIR, JoF
28