DTMF (Dual Tone Multi-Frequency) tones are the tones you hear
when you press the number keys on the phone keypad. DTMF
tones allow you to communicate with voice mailboxes,
computerised telephony systems, etc.
GPRS (General Packet Radio Service) enables wireless data
transmission. For wireless access to data networks, you will
need a GPRS access point from your network operator or service
provider. For further information, see “GPRS (General Packet
Radio Service)” on page 53.
GSM, the Global System for Mobile Communication, is the
technical standard for mobile radio networks.
HSCSD (High Speed Circuit Switched Data) makes data
connections faster for attractive GSM data services. For further
information, see “HSCSD (High Speed Circuit Switched Data)”
on page 54.
The IMEI is the serial number of your device and is supplied with
the car phone.
The PIN (Personal Identification Number) is a 4- to 8-digit code
that protects your SIM card from unauthorised use. The PIN
code is supplied with the SIM card. For further information, see
“Access codes required for the SIM card” on page 11.
The PUK (Personal Unblocking Key) is an 8-digit code that is
required to change a disabled PIN code.
The PUK code is supplied with the SIM card. If you lose the code
or it has not been provided with the SIM card, contact your
The SIM (Subscriber Identity Module) card contains all the
information the cellular network needs to identify the network
user. The SIM card also contains security-related data.
The network service SMS (Short Message Service) allows you to
send short text messages (of up to 160 characters) to mobile
phones and to receive short text messages from other mobile
users if this service is enabled.
You need the SMSC (Short Message Service Centre) number to
send text messages.