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[ubuntu] Broadband USB MODEM : Unable to establish Connection

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http://ubuntuforums.org – I have a ZTE-AC2726 Broadband USB MODEM and I am having a problem connecting. It used to work perfectly well with Previous versions of Ubuntu but not with 12.04, which I am currently using. I need help is establishing connection and I don't know where to start looking. Network-Manager, Modemmanager and usb_modeswitch are all in place. Network manager detects my said device as modem... so I really don't know nor have any idea where to look. I suspected that It could be ufw and tried to connect disabling ufw... it didn't help though. Any pointers to help me troubleshoot this issue are most (Hardware)