Huawei internet modems are the most popular modems in the market. When you buy a modem from the market, it is probably locked to a single mobile operator such as T-mobile, 3, Orange, Vodafone or Verizon. Therefore, you can use that modem only with one operator. Sometimes, Locking to one operator is annoying for most of the modem users. So, You must unlock your Huawei modem to use with any SIM. Today, I'm going to discuss on unlocking a Huawei modem within several minutes. Using this method, unlock code can be easily calculated by entering the IMEI number of the modem.Download the huawei unlock pack from the download links and run the Huawei Unlocker.exe. Enter the IMEI number of the modem to the application and click on Calculate button. It will generate both Unlock Code and Flash Code. Insert the modem into the USB port without having a SIM card.
Copy the Unlock Code and then run the HUAWEI MODEM Code Writer.exe. Now, Click on the "Please Selecet Com Port " button.
After, Click on the Detect button then it will detect your 3G modem, select the 3G modem and click Accept button.
Press the Unlock Modem button, it will open a small window 
Press the Unlock Modem button, it will open a small windowas shown in figure below.
Paste the Unlock Code that we copied earlier and click OK button to unlock the modem. Then, it will successfully unlock your modem.
Now, you can use that modem with any SIM card without any trouble.
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Many broadband users usually buy ZTE modems with internet data packages from various network operators such as T-mobile, Three, Orange and Verizon for connecting to the internet. However, most of the mobile network companies lock their modems to avoid using with another network companies. Therefore, most of the people need to unlock their modems for using with other networks. In this article, I will discuss about unlocking ZTE HSDPA modems. Here, I used dccrap in this unlocking process so that before you connect the modem to the USB, you need to put an invalid operator SIM Card. Hence, the software can identify your modem for unlocking. Let's see how to do this process step by step. You can get unlocking software from the below links.
First of all, put an invalid SIM card to the modem and remove memory card if it already contains a memory card. Then, connect the modem to the USB port on you PC. Close the ZTE software if it automatically opens when the modem connect to the PC. Now, extract the downloaded folder and run the dccrap.exe 
Choose ZTE datacards in a select manufacture option and then press the search button below. Hence, it will detect the modem and display the details of the modem.
Now, you can click Unlock button for unlocking the modem. While i was taking these screen shots, i don't have a modem for unlocking. So, you will see that the unlock button is disabled in the below screen shot. But, in actual case, unlock button will be enabled for unlocking. 
Your modem will be unlocked instantly........Do not forget to leave your comments below.