hmmm.... Now I cant connect to internet.... The Windows connect restart method doesnt work now.

Why is my computer fighting a bizarre war against me?

Maybe, just *maybe* review the hints given in this thread and see if you can work those if your "magic ClippyOS trick" doesn't stick.

A new discovery has been made!
As I wrote before:
It is just to change ttyUSBX to the correct number in administration and everything works.
Can anyone tell my why the modem connects to all USB ports? It is only the modem that does it. If you take any other hardware that uses USB, for instance USB-memory stick, then it connects to one USB port.

Judging by my Sierra cards, not your kind of card, the modem card has 4 USB ports. /dev/ttyUSB0 thru 3 are used by my cards. 1 data port, 1 control port, 1 status port & 1 diagnostic port? I forget it all and no reason yours is same, check for specifications sheets for your modem.
Sierra web pages want me to use long initialization strings plus several scripts. Connection is faster and more reliable without any initialization or any scripts.
You appear to by telling modem to dial *99# wait then dial *99# again regardless of outcome of first dial.

"ablo chat[5657]: send (ATDT*99#W*99#^M)"

Your string says attention, dial with tones *99#, wait 1 second, dial *99#, then the M thing. No memory of the M thing but I bet it is a standard bell modem command as are the AT & DT commands.

Recently I played with Kppp and found network name, modem name, PWD & UID can all be random strings. PAP/CHAP authentication was a problem, now I keep authentication set on script & have no script.

Windiz may be helping clear some initialization crap out of your modem.

Sierra AC860 & AC875 have 4 ports & I use ATT. Yours may be very different.