Portege R830 can see network but can't connect - Error 628

Question

Hello,
I want to use my SIM-card to establish an internet connection on a Portege R-830.
Inserted the SIM-cad, started Toshiba Wireless manager, enter PIN, searching vor Network: "o2 surf" found, perfect signal strength
But then: Either it aborts the connection process after 10 sec. without a word, or it is able to connect but with no internet and a few sec later I get all kinds of errors ending with no connection found or no error at all.
In addition I tryed the orginal Connection Manager form O2 but same problem but he gives me an Error report:
You have been disconnected (error 628).
On my cellphone everything is fine.

Answer 1

Ok, update:
I tryed another SIM (SIM B) with a simmilar mobile network(both o2 but internet via another protocol) , on another Portege R-830 with the same configuration and the same software and it worked.
So I reinstalled the software and driver on the first Laptop and I had a connection with SIM B.
But SIM A still didn't work. Inserted SIM B an now no connection either.
Reinstalled Toshiba Wireless manager en voil SIM B had internet connection....
my guess now is "it's the providers fault."