... , HUAWEI E392 4G LTE Multimode USB Modem like a big tree, derives many branch models, such as HUAWEI E392u-12, HUAWEI E392u-21, HUAWEI E392u-22, HUAWEI E392u-92, HUAWEI E392u-6, HUAWEI E392u-9, HUAWEI E392u ... -511 etc… They are for different operators in different areas, so they incorporates difference modules to support various 4G ...