You need to download the following packages:
http://mirror.slitaz.org/packages/cooking/linux-dialup-2.6.37.tazpkg
http://mirror.slitaz.org/packages/cooking/xplc-0.3.13.tazpkg
http://mirror.slitaz.org/packages/cooking/wvstreams-4.6.1.tazpkg
http://mirror.slitaz.org/packages/cooking/wvdial-1.61.tazpkg
http://mirror.slitaz.org/packages/cooking/gnome-ppp-0.3.23.tazpkg
Put them on a USB Memory stick and then boot up SliTaz. Copy all the packages to your home folder (the one you go to when you double click on the My Documents icon on your desktop). Now open xterm from your 'start' menu. Then do the following:
1. Type su
and press the enter/return key. Enter your root password (default is root) and press the enter/return key. You are now in root mode.
2. Type tazpkg install linux-dialup-2.6.37.tazpkg
and press the enter/return key.
3. Type tazpkg install xplc-0.3.13.tazpkg
and press the enter/return key.
4. Type tazpkg install wvstreams-4.6.1.tazpkg
and press the enter/return key.
5. Type tazpkg install wvdial-1.61.tazpkg
and press the enter/return key.
6. Type tazpkg install gnome-ppp-0.3.23.tazpkg
and press the enter/return key.
7. Type modprobe cdc_acm
and press the enter/return key.
8. Type modprobe option
and press the enter/return key.
9. Plug in the phone with it's USB cable to the PC.
10. Type dmesg
and press the enter/return key.
11. Look for something like:
usb 1-1: new full speed USB device using ohci_hcd and address 2
usb 1-1: configuration #1 chosen from 1 choice
cdc_acm 1-1:1.8: ttyACM0: USB ACM device
or
usb 1-1: new full speed USB device using ohci_hcd and address 2
usb 1-1: configuration #1 chosen from 1 choice
usb-serial 1-1:1.8: ttyUSB0: USB device
Note the ttyUSB or ttyACM device - it may NOT be ttyUSB0 or ttyACM0
13. Type gnome-ppp press the enter/return key.
14. In the gnome-ppp box that pops up, click on the Setup button.
15. In the Device text box, enter the ttyUSB or ttyACM device you noted before with dmesg. It should look something like this:
/dev/ttyUSB0
or /dev/ttyACM0
16. Click close and enter the number *99# into the Phone number box if it's not there already. Click the connect button.
If everything worked perfectly, you should be connected now.