I can confirm a similar situation here when using Networkmanager and
modemmanager as suplplied by ubuntu maverick repos. Last version that
worked for me was modemmanager 0.3.0 in lucid. My data is:

Linux xikitin 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 01:41:57 UTC
2010 i686 GNU/Linux

modemmanager:
  Instalados: 0.4+git.20101208t230459.592d71f-0ubuntu1~nmt1~maverick
  Candidato:  0.4+git.20101208t230459.592d71f-0ubuntu1~nmt1~maverick
  Tabla de versión:
 *** 0.4+git.20101208t230459.592d71f-0ubuntu1~nmt1~maverick 0
        500 http://ppa.launchpad.net/network-manager/trunk/ubuntu/ 
maverick/main i386 Packages
        100 /var/lib/dpkg/status
     0.4+git.20100809t153145.be28089-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ maverick/main i386 Packages
        500 http://es.archive.ubuntu.com/ubuntu/ maverick/main i386 Packages

Both 0.4 versions show the same behavior.

network-manager:
  Instalados: 0.8.1+git.20101019t162207.0a43b45-0ubuntu1~nmt1~mtrudel1
  Candidato:  0.8.1+git.20101019t162207.0a43b45-0ubuntu1~nmt1~mtrudel1
  Tabla de versión:
 *** 0.8.1+git.20101019t162207.0a43b45-0ubuntu1~nmt1~mtrudel1 0
        500 http://ppa.launchpad.net/network-manager/trunk/ubuntu/ 
maverick/main i386 Packages
        100 /var/lib/dpkg/status
     0.8.1+git.20100810t184654.ab580f4-0ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ maverick/main i386 Packages
        500 http://es.archive.ubuntu.com/ubuntu/ maverick/main i386 Packages

The daemon.log lines affecting this behavior are:

Dec 15 01:45:22 xikitin NetworkManager[1063]: <info> Activation (ttyUSB0) 
starting connection 'Movistar'
Dec 15 01:45:22 xikitin NetworkManager[1063]: <info> (ttyUSB0): device state 
change: 3 -> 4 (reason 0)
Dec 15 01:45:22 xikitin NetworkManager[1063]: <info> Activation (ttyUSB0) Stage 
1 of 5 (Device Prepare) scheduled...
Dec 15 01:45:22 xikitin NetworkManager[1063]: <info> Activation (ttyUSB0) Stage 
1 of 5 (Device Prepare) started...
Dec 15 01:45:22 xikitin NetworkManager[1063]: <info> (ttyUSB0): device state 
change: 4 -> 6 (reason 0)
Dec 15 01:45:22 xikitin NetworkManager[1063]: <info> Activation (ttyUSB0) Stage 
1 of 5 (Device Prepare) complete.
Dec 15 01:45:22 xikitin NetworkManager[1063]: Tried to set deprecated property 
gsm/puk
Dec 15 01:45:22 xikitin NetworkManager[1063]: Tried to set deprecated property 
gsm/puk
Dec 15 01:45:22 xikitin NetworkManager[1063]: <info> Activation (ttyUSB0) Stage 
1 of 5 (Device Prepare) scheduled...
Dec 15 01:45:22 xikitin NetworkManager[1063]: <info> Activation (ttyUSB0) Stage 
1 of 5 (Device Prepare) started...
Dec 15 01:45:22 xikitin NetworkManager[1063]: <info> (ttyUSB0): device state 
change: 6 -> 4 (reason 0)
Dec 15 01:45:22 xikitin NetworkManager[1063]: <info> Activation (ttyUSB0) Stage 
1 of 5 (Device Prepare) complete.
Dec 15 01:45:22 xikitin NetworkManager[1063]: <warn> GSM modem enable failed: 
(32) SIM PIN required
Dec 15 01:45:22 xikitin modem-manager: (ttyUSB0) opening serial device...
Dec 15 01:45:22 xikitin modem-manager: Modem 
/org/freedesktop/ModemManager/Modems/0: unlock no longer required
Dec 15 01:45:22 xikitin modem-manager: Modem 
/org/freedesktop/ModemManager/Modems/0: # unlock retries for (null) is 0
Dec 15 01:45:22 xikitin modem-manager: (ttyUSB0) closing serial device...
Dec 15 01:45:22 xikitin modem-manager: (ttyUSB0) opening serial device...
Dec 15 01:45:22 xikitin modem-manager: Modem 
/org/freedesktop/ModemManager/Modems/0: state changed (disabled -> enabling)
Dec 15 01:45:24 xikitin modem-manager: Modem 
/org/freedesktop/ModemManager/Modems/0: state changed (enabling -> enabled)
Dec 15 01:45:24 xikitin modem-manager: CS registration state changed: 2
Dec 15 01:45:24 xikitin modem-manager: Modem 
/org/freedesktop/ModemManager/Modems/0: state changed (enabled -> searching)
Dec 15 01:45:24 xikitin modem-manager: PS registration state changed: 2
Dec 15 01:45:26 xikitin modem-manager: (ttyUSB0) closing serial device...
Dec 15 01:45:26 xikitin NetworkManager[1063]: <warn> GSM connection failed: 
(32) Serial port is now closed
Dec 15 01:45:26 xikitin NetworkManager[1063]: <info> (ttyUSB0): device state 
change: 4 -> 9 (reason 1)
Dec 15 01:45:26 xikitin NetworkManager[1063]: <info> Marking connection 
'Movistar' invalid.
Dec 15 01:45:26 xikitin NetworkManager[1063]: <warn> Activation (ttyUSB0) 
failed.
Dec 15 01:45:26 xikitin NetworkManager[1063]: <info> (ttyUSB0): device state 
change: 9 -> 3 (reason 0)
Dec 15 01:45:26 xikitin NetworkManager[1063]: <info> (ttyUSB0): deactivating 
device (reason: 0).
Dec 15 01:45:26 xikitin modem-manager: Modem 
/org/freedesktop/ModemManager/Modems/0: state changed (searching -> disabled)
Dec 15 01:45:26 xikitin modem-manager: Removed modem 
/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-2

After this the modem dissapears and must be plugged again to reapear in
networkmanager list of connections. The connection never succeeds.

I traced down the issue to some SIM exchange issue (see above about bad
SIM exchange). If you use your SIM card in a phone, you can disable SIM
security and then the connection suceeds.

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https://bugs.launchpad.net/bugs/689894

Title:
  Huawei modem disappears / reappears when trying to connect

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