Enable mobile broadband not working in ubuntu 12.04

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http://askubuntu.com – I'm using an EVDO usb Modem. It works perfectly fine for few times. But now on wards when ever I try to connect it shows not enabled in status . I tried to enable it by ticking "Enable Mobile Broadband" but still it shows not enabled but that option gets a checked(tick) mark. And when ever I restart my system "Enable Mobile Broadband" option autamatically unchecked. Any help please (HowTos)