If you bought a 3G data-card from service providers like Airtel,Idea,Aircel or Reliance,the data card will work only with the service providers SIM.If you insert a different SIM you will be asked for the unlock code and your data card will be locked. You will not be able to use other good and high usage plans provided by different service provider. You have to stick with the service provider plans who has provide you data-card. if you like or not.
Download Universal master code generator. You can also use DC unlocker but Universal master code generator is used to calculate the unlock and Flash codes for Huawei E-173.Also Download and install Huawei E-173 Firmware (Download latest by searching in Google for Huawei E-173 Firmware ) to update your firmware.
After downloading Universal master code generator plugin your data card and run the software.Now enter the IMEI number which you can note down form your device and the Calculate Button.so the Unlock code and the Flash code will be calculated.Now insert a different Sim like Aircel ,Idea or Vodaphone (Different form the Data card provider).
You will be demanded for Unlock Code. Enter The code that was generated by Universal master code generator. and it done. You ave unlock the Airtel 3G Data Card -Huawei E173.Download the Huawei Mobile partner Software from here.This software is a GUI to
create a new profile to connect to the internet.
After downloading Huawei Mobile partner Software create a new profile by navigating Tools>>Options>>Profile Management. Enter the APN and save the profile and click on the connect button.
That's it. Don't Forget to make comments. I dont charge to give reply if you ace any problem while unlocking