Nokia 6185 - Manual (Page 87)

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You should only have to make this modification once;
these settings typically are saved as a part of your data or
fax program’s settings. Please refer to the documentation
or online help files for your data or fax application when
modifying your modem’s initialization string.
When the software has sent the proper command to your
phone, the phone will display Ready for data reception
or Ready for fax reception momentarily, along with
either a d or f status indicator at the start screen.
Once your phone is preset for either data or fax reception,
you cannot receive incoming voice calls. You must either
remove the data cable or turn the phone’s power off and
back on to restore normal voice call reception.