Huawei Mate 2 - Factory Unlocked (White) Large display: 6.1 inch Large battery capacity: 3900 mAh (typical) Front facing camera: 5M pixel, wide angle, panorama Reverse charging.Download the Greenify app from the Google Play Store. Here, you can see a list of applications that are active on waking the phone, and you can then change the settings for these apps, which should help with reduce any slowdowns. 4G LTE Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.