Re: still configuring PPP :-(
> Hello and thanks a million to those who have responded to my request for
> taking some of your precious time to help me out.
> I downloaded wvdial and minicom like some of you suggested and wvdial
> cannot find my modem. I sent a message to them like they suggested because
> I am 100% sure that my modem is in Com3. For some reason Linux is not
> detecting it in ttyS2.
COM1 and COM3 typically share IRQ4, and COM2 and COM4 typically share IRQ3. If you look at the output of the dmesg command (dmesg | grep ttyS) soon after booting you should be able to see the Linux kernel's detection of these devices.
I guess that Linux will have no problems with the modem in COM3. Certainly it handles multiport serial cards that share interrupts with no problems.
Still, in your present predicament I would be trying the modem on ttyS0 or ttyS1. Maybe you can move your two other serial devices and give this a try.