I searched the internet for days looking for a Huawei e303 unlock code generator. Finally, I have the solution and decide to share it to all Nairalanders and at the same time, encourage the spirit of sharing information that cost you virtually nothing to obtain. Below is the link to the site. You are required to have a google account that is google+ activated.
feel free to comment if you don't understand how to go about the process.

http://www.modemunlock.com/huawei-new-algo-unlock-code-calculator.html
The above site contains the instructions and the link to the online application. I noticed it runs very slowly, so here is the direct link to the application which does not contain the instructions.

Straight to the applicationhttp://huaweicodecalculator.com/new-algo/

Remember: you got it free and don't hesitate to share.
NB: Unlocking Glo modems at the moment seems impossible but with time, I will give Nairalanders the full procedure on how to get it unlocked.

Thanks Bro...

You can unlock here http://huaweiunlockcalculator.com

If anyone was unable to unlock your modem by the above unlocking method means,try alternative solutions.Yes it's online unlocking service.If you need cheapest online unlocking solutions means visit SimpleUnlocking.com When i had the same situation,I chose alternative solutions.So only i recommend this way.