because yesterday I did lots of tests in this verse, and all have failed, plus, sometimes change error, without any correlation with the change of configuration (start wvdial twice and returns the first error).

Example with first usable configuration in ubuntu forum page:
[Dialer Defaults]
Modem ...

You do not know any way to check what is the problem? Maybe with pppd?

Normally I would not be so intrusive, but I'm afraid of having to use windows unless i solve.
my days are counted

ok, I made ​​some progress.
If I reboot and plug my modem during the startup of linux, this time the modem will automatically switch:
tc@box:/$ lsusb
Bus 001 Device 007: ID 1c9e:9605


I am going to use wvdial, this is my, /etc/wvdial.conf :
[Dialer Defaults]
Phone = *99#
Username = wind ...

First of all I apologize for my English, I not speak it well and I use gTranslate in help to writing this post.

I have a Mobidata MBD-220HU and after inserting the pen will not switch automatically.
I followed step by step this pdf guide (obviously skipping steps (1) & (2), having installed ...