NEC DB500, Руководство пользователя

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Before you start
Cellphone system structure
It is worth remembering that every time you use your phone, three different organisations are involved:
All the features described in this user guide are supported by your DB500 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 9).
User guide structure
This user guide is divided into subjects represented by the headings and icons shown opposite. To help you work your way through this guide, the relevant subject icon is shown at the top of
each page.
The people that
make your phone
The people that supply
your SIM card and bills
The people that
transmit your calls
Service
Provider
Network