Here is how you can configure the RConnect modem on Fedora core. You have to use kppp to dial. Just configure the settings as per the image given below and you are done. It works great with speed up to almost 110 kbps and no line drops stays connected untill you drop the line.
While creating modem either select ttyS0 if you have serial cable and
/dev/usb/ttyACM0 if you are using USB port. Replace the 0 with the appropriate port number here it can range from 0 to 4 or even more depending upon how many serial and usb ports that you have. Replace the Initialization string with that one which is suitable for your phone. You can find this string in the linux driver that reliance ships on its web site or just call them and they will tell you or use google or go through the manual that accompanies your phone.
Just works ...
No more hassles and pain.