The debug log above seemed to have used the generic GSM driver. Attached
here is the log using Ericsson MBM plugin. The last part where the
connection problem occur is the same:

modem-manager[26690]: <debug> [1304323829.202224] [mm-at-serial-port.c:298] 
debug_log(): (ttyACM1): <-- '<CR><LF>+CIEV: 2,3<CR><LF>'
modem-manager[26690]: <debug> [1304323837.153917] [mm-generic-gsm.c:4362] 
simple_connect(): (usb0): home_only => TRUE
modem-manager[26690]: <debug> [1304323837.154401] [mm-generic-gsm.c:4362] 
simple_connect(): (usb0): number => "*99#"
modem-manager[26690]: <debug> [1304323837.154734] [mm-generic-gsm.c:4362] 
simple_connect(): (usb0): password => "netcom"
modem-manager[26690]: <debug> [1304323837.155060] [mm-generic-gsm.c:4362] 
simple_connect(): (usb0): pin => "****"
modem-manager[26690]: <debug> [1304323837.155401] [mm-generic-gsm.c:4362] 
simple_connect(): (usb0): allowed_mode => 0
modem-manager[26690]: <debug> [1304323837.155734] [mm-generic-gsm.c:4362] 
simple_connect(): (usb0): username => "netcom"
modem-manager[26690]: <debug> [1304323837.156073] [mm-generic-gsm.c:4362] 
simple_connect(): (usb0): network_mode => 0
modem-manager[26690]: <debug> [1304323837.156411] [mm-generic-gsm.c:4362] 
simple_connect(): (usb0): apn => "internet.netcom.no"
modem-manager[26690]: <debug> [1304323837.156785] [mm-generic-gsm.c:4251] 
simple_state_machine(): (usb0): simple connect state 0
modem-manager[26690]: <debug> [1304323837.157586] [mm-generic-gsm.c:4251] 
simple_state_machine(): (usb0): simple connect state 2
modem-manager[26690]: <debug> [1304323837.659408] [mm-at-serial-port.c:298] 
debug_log(): (ttyACM0): --> 'AT+CREG?<CR>'
modem-manager[26690]: <debug> [1304323837.670178] [mm-at-serial-port.c:298] 
debug_log(): (ttyACM0): <-- 'AT+CREG?<CR>'
modem-manager[26690]: <debug> [1304323837.674199] [mm-at-serial-port.c:298] 
debug_log(): (ttyACM0): <-- '<CR><LF>+CREG: 0,1<CR><LF><CR><LF>OK<CR><LF>'
modem-manager[26690]: <debug> [1304323847.122236] [mm-at-serial-port.c:298] 
debug_log(): (ttyACM1): <-- '<CR><LF>+CIEV: 2,4<CR><LF>'

Is it misinterpreting the response, in that it responds with both
"+CREG" and "OK"? I also see that it seems to repeat "AT+CREG?". Maybe
echo got enabled after disconnection and modemmanager can't handle it?

** Attachment added: "Debug output of modemmanager using Ericsson MBM plugin"
   
https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/769497/+attachment/2105356/+files/modemmanager_ericsson_bug.txt

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https://bugs.launchpad.net/bugs/769497

Title:
  Reconnect not possible after disconnection or lost connection using
  Ericsson MBM

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