How to unlock Huawei E153 Dialog or Mobitel modem

 Unlocking Huawei E153 HSDPA modem is a simple 3 step process. You can use any network once you follow these 3 steps.

1. Download the Huawei firmware update manager from here Huawei E153 Firmware updater .
2. Then plug the dongle into the computer and run the exe file. At some point in the process it will ask for the password. This is the password needed to flash the firmware and update the new firmware. 
3. You can get your password from this link. http://tools.texby.com/unlock-codes/huawei/ . Just insert the IMEI number of your device.  If your IMEI number (Which is mentioned inside the dongle or you can find it from your invoice also. This is a 15 digit number) is 123456789012345, 

IMEI: 123456789012345

Unlock code for your IMEI number is 38563052 and flash code is 61539927

Password which you need to give to the software is 61539927. This is the flashing password. 

Once you give the password, then it will update the firmware and it will automatically install the new drivers. Then you can use any SIM card with this dongle.

Enjoy Hacking !!!!!!!!!!!!!!!!!!!!!!!!

More complete and advanced method is mentioned in this blog Unlock any Huawei Modem