NEC N820 Manual page 6

Before You Start
Cellphone system structure
It is worth remembering that every time you use your phone, three or four different organizations are involved:
The people that
make your phone
All the features described in this user's manual 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 13).
User's manual conventions
The instructions in this user's manual make use of the shortcuts selection except special cases.
The following markers are used throughout the user's manual to attract your attention:
This type of paragraph will contain details of where to find information related to the topic in question.
This type of paragraph will contain information worth noting.
This type of paragraph will contain important information.
iv
Service
Provider
The people that supply
your SIM card and bills
Network
The people that
transmit your calls
WAP Service Provider
The people that
provide your Internet services