Nokia 3555 - Packet data, HSCSD, and CSD

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Packet data, HSCSD, and CSD

With your phone you can use the packet data, high-speed circuit switched
data (HSCSD), and circuit switched data (CSD, GSM data) data services. For
availability and subscription to data services, contact your network operator
or service provider. See "Modem settings," p. 60.

The use of HSCSD services consumes the phone battery faster than normal
voice or data calls.