After looking for a perfect solution, i have found an app called Sakis3g. It is the best option for this task, it will search for your 3g modems and create the connection to your ISP.
You need to follow instructions here http://wiki.sakis3g.org/wiki/index.php?title=Sakis3G_installation
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| 3G connected with Huawei E1762 USB modem |