Public bug reported:

Network manager doesn't connect to mobile broadband using the Dell 5530
hsdpa mini-pci card. Shows up in network-manager as having a gsm device,
but even with the correct settings it wont connect.

I did manage to get it working by installing gnome-ppp and manually
configuring AT commands the card requires to active the radio and set
the APN. I can get connected this way, but it is not as nice as being
able to use network-manager. It also required my user to be added to the
dialout and dip groups I think.

The 5530 card requires these AT commands to activate radio and set the APN and 
so on:
AT+CFUN=1
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
AT+CGDCONT=1,"IP","VirginBroadband"

Obviously replacing the VirginBroadband with the appropriate APN for the
connection.

I don't know if its worthwhile but maybe if the network-manager tool had
the ability to customise AT init strings under and advanced button for
mobile broadband or dial-up modems?

Also the card also supports GPS which can be enabled with (for example):
AT+CFUN=1
AT*E2GPSCTL=1,5,1
AT*E2GPSNPD

lsb_release -rd :
Description:    Ubuntu lucid (development branch)
Release:        10.04

t...@timw-laptop:~$ apt-cache policy network-manager
network-manager:
  Installed: 0.8-0ubuntu2
  Candidate: 0.8-0ubuntu2
  Version table:
 *** 0.8-0ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

** Affects: ubuntu
     Importance: Undecided
         Status: New

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