Huawei E3276 is an 4g LET Modem which provides upto 150mbps of high speed.
Huawei E3276 is also supporting 3g and 2g networks.
Here in this article you can find how to unlock Huawei E3276 Modem.
Some of these operations might damage your phone and most of them threaten to void the device warranty.
If you are aware but not bothered by those issues, the program can provide you with some interesting alternatives to buying a new phone.
This means you can customize boot, recovery and system images on your phone as you desire.
You can easily see that you have successfully unlocked the Bootloader by looking at the top of the screen when entering the Bootloader screen.