Connect device to PC with USB cableLaunch DC-Unlocker clientDetect device by selecting Huawei modems from manufacturers drop down menu list, then click magnifying glass buttonWait till program detects itOpen Server tab, enter your username and password that you received after credits purchase. Click 'Check login'. For example if it's locked to operator 'A' insert operator's 'B' sim. Vodafone r20..