Y15s boasts a 5,000mAh (TYP) battery that ensures plenty of life every day. It is also engineered to offer 5V/1A Reverse Charging, so your Y15s can be used to charge other devices, like a mobile power bank. Put two SIM cards into one phone and save yourself the hassle of switching cards. The third card slot supports memory expansion of up to 1TB, so there’s plenty of room for all your cherished photos and videos. Live life to the fullest. Vivo’s Face Wake unlocks your phone the moment it recognizes your face as you pick it up and wake it. When paired with Side Fingerprint, accessing your phone has never been so smart and easy.