5.Tap 
next to Service and select a service option.
Note: Use caution when modifying your existing settings. You could impair your phone’s ability to connect to a network. Consult the User Guide library for detailed instructions on using data applications.
USING FAX/MODEM
You can use the built-in wireless modem in your Kyocera 7135 smartphone just like a standard external modem to your desktop computer or laptop. You can also use it to send or receive faxes from the computer. Notice, however, that you cannot make or receive voice calls or use any other applications while the modem is in Data/Fax mode. Incoming phone calls will be redirected to voice mail. Opening any other application terminates the modem call.
