Unlocking is quite easy. You just need to enter the IMEI (serial number on the back of the stick) at
Online Huawei Modem Unlock Calculator and within seconds an unlock code will be generated.
Then you would download a dashboard update for your stick from
3G modem wiki Home - 3G modem wiki and run it. This will replace the operator-branded (and perhaps restricted) dashboard software on your stick's integrated flash memory by a generic dashboard, which will work on any network.
Finally uninstall the operator-branded dashboard from your computer, install the now unbranded one from your stick and start it. If you use a third-party SIM card and the stick is actually locked, you will be required to enter an unlock code at some point. That's it.