Nokia 30 GSM User Manual page 10

GPRS
With GPRS (General Packet Radio Service) data is transferred over the network in small, standardized
packets. Transferring data as packets makes the transfer more efficient. Given that the Nokia 30
supports GPRS multi-slot class 6, multiple timeslots can be used for data transfer at the same time.
HSCSD
With HSCSD (High Speed Circuit Switched Data) the Nokia 30 acts as a multi-slot class 6 terminal and
it offers data transfer speeds of up to 43.2 kbit/s.
CSD
CSD (Circuit Switched Data) offers data speed of up to 14.4 kbit/s.
SMS
SMS (Short Message Service) is used to send and receive messages containing a maximum of 160
characters via the Nokia 30. SMS is a convenient way to pass data quickly and easily to and from Nokia
30 terminals.
USSD
USSD (Unstructured Supplementary Services Data) offers reliable interactive messaging services. USSD
can be used to send and receive messages containing a maximum of 182 characters via the Nokia 30.
With USSD, the session is established for the duration of the connection. This increases data transfer
reliability and shortens response times as the delay is known.
Note: USSD messages can only be sent to the network, not directly to another mobile terminal.
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