Samsung SCH-N150 - Manual (Page 103)

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Ending a fax or data call
Some of the normal ways to end a call, like closing the phone, will not end a
fax or data call. Always close the connection through the application on your
computer. Your phone will return to standby mode. Disconnecting the data
cable or turning off your phone will also end a data or fax call, but may disrupt
your computer.
Sending a fax or data file
When connected to a computing device, your phone allows wireless fax and
data transmissions. Your computing device software initiates the call to the
destination phone number. Your Samsung phone functions as a wireless
modem to send the fax or data file to the number designated by your PC
software.