Follow these steps.
1. Go to the link by clicking here.
2. Now click the Sign in with Google+
3. Next you have to give your email address and email password for log in.
4. Then you have to agree with there terms and privacy policies.
5. After that give your dongles IMEI number and simply click on Calculate button. (IMEI number is a number that can find in behind your dongle or your dongle holder)
6. Now click on G+1 button to see your unlock code.
7. Then you can see a code like as my screen shot given in the below and copy NEW ALGO CODE.
8. Now remove your sim card and insert a sim card in another network. Give the code above you have copied as your unlock code.
Must be considerd :-
1. Only you can unlock 10 times from one email address.
2. You can see the list of dongle can in official site.
3. If you can not connect to the internet after unlocking, go to Tools--> Options--> Profile management-->New
Now create a new profile. Then you can connect to the internet without any problem.