1. Download the two files below.
http://jump.fm/BOLEN
http://jump.fm/CVQYI
2. Download QPST and install it.
3. Connect your ZTE MF626 to PC. Install the connection manager on it and install the drivers for your modem.
4. Start QPST Configuration and your modem port.(click Add New Port)
5. Keep adding ports till you get port which says SUR6246.... under the Phone section.
6. Select COM port which says SURF6246. Click on start clients. EFS Explorer.
7. In the phone section it should say SURF6246.... Click ok.
8. Backup the file PCUI.VN from the modem and delete it.
9. Replace PCUI.VN with the PCUI.VN you downloaded above.
10. Close EFS Explorer and QPST Configuration.
11. Upgrade your modem with MTS dashboard downloaded above. Run it. You probably won't be able to read anything cause its in Russian. Once the upgrade utility detect your modem. The "DOWNLOAD" button will become active. Click on download and it will start the upgrade.(Do not worry the dashboard has English language)
12. It will take around 15 minutes to upgrade.
13. Once it is finished. Remove the modem.
14.Uninstall your previous connection manager. Reinsert the modem.
15. Install MTS Connect Manager from the modem.
Now you will be able to make voice calls using your ZTE MF626.

found this over http://www.dc-unlocker.com/forum/showthread.php?t=3400

I have one of these, I'm going to see if it works