I run a DELL Latitude E4300, which also features a DELL Mobile HSDPA Modem 
DW5530
. I observe the same problems as stated above, but the problem is definitely 
caused by a faulty handling of special characters in Gnome's Network Manager. 
This report refers to a fresh Lucid (10.04 LTS)  install with all updates 
available to date (30.09.2010). 

I live in Austria and the ISP for my mobile broadband internet
connection is usually A1. Since updating from Jaunty (9.04), where the
modem worked like a charm, I never managed to connect to the Internet in
Lucid, though all settings were double-checked to be identical.

However, thanks to Google, I found an Austrian forum article (sorry,
I've lost the link) stating, that this probably is a result of a
mishandling of special characters in either the login and/or password by
the Network Manager. And, indeed, the login of the A1 internet
connection is “...@aplus.at”, please refer to e.g. [1].

To confirm this bug, I've installed an other SIM card, this time from
T-Mobile Austria, and -- believe it or not -- it worked. As can be seen
in [1], for this ISP neither the login nor the password shows special
characters, hence I think, that the cause for this bug can be considered
as confirmed. This also explains, why only very few people seem to have
this problem.

[1] http://linux.frankenberger.at/Huawei_E220_Daten.html

-- 
network-manager doesn't work with dell 5530 hsdpa mobile broadband
https://bugs.launchpad.net/bugs/540003
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