The Vivo Y51 runs FunTouch OS is based on Android 5.0.2 and packs 16GB of inbuilt storage that can be expanded via microSD card (up to 128GB). The Vivo Y51 is a dual-SIM (GSM and GSM) smartphone that accepts Micro-SIM and Micro-SIM cards. The Vivo Y51 measures 143.80 x 71.70 x 7.52mm (height x width x thickness) and weighs 157.00 grams. It was launched in White colour. Connectivity options on the Vivo Y51 include Wi-Fi, GPS, FM radio, 3G, and 4G (with support for Band 40 used by some LTE networks in India). Sensors on the phone include accelerometer, ambient light sensor, gyroscope, and proximity sensor.