This is how I connect to internet from fedora box using my motorola L6 GPRS modem. I use this procedure with Teletalk connection.
After a fresh fedora installation I enter the following command in the shell. This command creates a wvdial configuration file for my modem.
# wvdialconf /etc/wvdial.conf
Now I need to modify some contents of wvdial.conf file. To do so I open the /etc/wvdial.conf using VI or other text editor. And replace the content of the file with the following text and save it.
[Dialer Defaults]
Modem = /dev/ttyACM0
Baud = 460800
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ISDN = 0
Modem Type = USB Modem
Phone = *99#
Username = A
Password = B
Stupid Mode = 1
I make sure to set username = A, Password=B and Stupid Mode = 1 and do not modify the line
Modem = .....
as this is my device name (this line can very with your phone set). Now whenever I need to connect to internet I just enter the following command to the shell.
# wvdial
Thats all. Same way you can turn your mobile set to internet from fedora with no or little modification.