I can connect to internet by modem, when i plug the device before booting.After unplugging and when try to re plug the modem after log in,there is no enable mobile network option and i cannot connect to the internet.Can anyone help me ?....
closed as too localized by qbi, Eric Carvalho, Ringtail, James♦ Jan 16 '13 at 2:56
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There's a bit of a bug in Network Manager 0.9.4.0 that prevents it from detecting the 3G modem all of the time. I had this intermittent problem with the built-in Huawei modem in my EeePC. The problem seems to have been resolved with Network manager 0.9.6.0 which ships with 12.10.
You should try restarting Network Manager in the first instance. In a terminal:
and see if that enables the 3G modem when you insert after booting.
Consider upgrading to 12.10, installing Network Manager 0.9.6.0 (into 12.04 LTS), or wait until the later Network Manager 0.9.6.0 is upgraded in 12.04 LTS. Version upgrades can take a while to be incorporated into previous releases, even (or especially) LTS ones. I believe this will happen, but it probably won't be until this bug is also fixed to everyone's satisfaction.
3G has been a rocky road since 11.04, I'm afraid. As stated in that bug, you will have to enable Wireless broadband again after every boot or resume. There's a nice work-around that works for a clean boot however.