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With HSDPA you can transfer data faster than when using 3G and GPRS provided that your phone is connected to a 3G network. Follow these instructions to turn HSDPA on or off.
Find "High speed packet access"
Press the Menu key.
Press Admin. settings.
Press Packet data.
Press High speed packet access.
Turn HSDPA on or off
Press Enabled or Disabled.
Press Yes to confirm.
Press the Menu key to return to standby mode.