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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 "Mobile data"
Press the Menu key.
Press Admin. settings.
Press Mobile data.
Turn HSDPA on or off
Press High speed packet access to select Enabled or Disabled.
If required, press Yes to confirm.
Press the Menu key to return to standby mode.