Since i'm busy & can not find a time to update my blog, I have decided to give you a good link where you can get a good Tutorial + Tool to Unlock your modem.
Go & Enjoy - https://sites.google.com/site/huaweiunlocktool/guide
This Supports even new models like E153, E173 as well.
Step 1 -
Comment your IMEI and model of above mentioned types of modem and wait for my reply with unlock code.
Step 2 -
Once I post your unlock code, download unlock tool from here. Download Unlock Tool Here
Step 3 -
Connect your modem to PC/Laptop and wait it detects your modem. Then run above downloaded unlock tool
Step 4 -
Click " Scan for Huawei Dongle" button and wait it detects your modem.
Step 5 -
Enter unlock code i have send you for your IMEI in the " Unlock Code" text box and click on "Send Code" button.
Step 6 -
Now it will unlock your modem and says successfully unlocked. Then have fun with new ISP