Unlocked cell phones are compatible with GSM carrier such as AT&T and T-Mobile, but are not compatible with CDMA carriers such as Verizon and Sprint. Oppo?s A7 is successor to the A5 is powered by a Snapdragon 450 chipset, 4GB of RAM and an expandable storage of 64GB. The Oppo A7 sports a water drop notch display with HD resolution. The large battery with 4230mAh is covered by a 3D artistic texture back. Also on the back is a dual camera (13MP+2MP) and a fingerprint sensor to unlock the mobile phone. For a modern look, the Oppo A7 features a waterdrop notch. The 6.2-inch screen has a resolution of 1520 x 720 pixels (271ppi). The A7 is equipped with the 64bit Qualcomm Snapdragon processor with eight cores and up to 1.8GHz burst frequency, paired with 4GB of RAM and an Adreno 506 GPU. This configuration is good enough for day-to-day usage, multi-tasking and basic games. The internal storage of 64GB can be expanded with a microSD memory card. As for the cameras, the rear camera is a dual camera setup which combines a 13-megapixel main sensor with f/2.2 aperture and a 2-megapixel depth sensor. The front camera is a 16-megapixel shooter with f/2.0 aperture and wide-angle lens. The front camera can be also used to unlock the phone with facial recognition. The Oppo A7 packs a large 4230mAh battery. In addition, there is dual 4G with VoLTE support and further specifications include Bluetooth 4.2, Wi-Fi 802.11b/g/n, USB-OTG, FM radio, basic sensors like a compass, accelerometer, light sensor, and gyroscope, and support for three navigation systems. The Oppo A7 runs on ColorOS 5.2 which is based on Android 8.1.