Cellphone System Structure; User Guide Conventions - NEC DB4000 Manual

Before you start

Cellphone system structure

It is worth remembering that every time you use your phone, three different organisations are involved:
The people that
make your phone
All the features described in this user guide are supported by your phone . However, for all these features to work, you must have a SIM card (supplied by your Service Provider) that also
supports these features. Even if you have a fully featured SIM card, any feature not supported by the Network transmitting your call will not work. This last point is especially important when you
are roaming networks (see page 10).

User guide conventions

The following markers are used throughout the user guide to attract your attention:
$
This type of paragraph will contain details of where to find related information to the topic being explained.
O
This type of paragraph will contain information worth noting.
I
This type of paragraph will contain important information often regarding SIM cards, Service Providers and or Network facilities.
Service
Provider
The people that supply
your SIM card and bills
Network
The people that
transmit your calls