I found a workaround for my Option Icon 255. I entered a dummy username and 
password in my mobile broadband connection settings, because these values were 
usually blank for my carrier O2 Germany. Then, I'm able to connect and the 
connection does not drop anymore as it was the case without specified username 
and password. 
My carrier O2 requires no username and password and ignores these values, maybe 
network manager should set the authentication type to 0 (this stands for none), 
when blank password and username are given. Currently, it sets the 
authentication type to 1 (stands for PAP = Password Authentication Protocol) 
and sends empty strings for username and password.

This behaviour is reflected in gabriela's log:
NetworkManager: <debug> [1240880027.417063] nm_serial_debug(): Sending: 
'AT$QCPDPP=1,1,"",""
Then the authentication failed:
NetworkManager: <WARN>  hso_auth_done(): Authentication failed
and the connection is dropped

@gabriela your seriallog implies that you have not specified username
and password too. Maybe you can try some dummy values, and my workaround
works for the option icon 225, too.

As a result, I can confirm that the Option Icon 255 works out-of-the-box
in Jaunty, when a dummy username and password is used.  Maybe, network
manager should use none authentication, when no username and password
are specified in the mobile broadband connection's settings.

-- 
Option iCon 225 (HSDPA USB stick) cannot connect (Jaunty Jackalope 9.04)
https://bugs.launchpad.net/bugs/368325
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