Some phones do not fear being damaged even if they fall into the water. Because these are waterproof phones, this feature is available on some expensive budget smartphones. But if you use Oppo A77 4G, you will not get this facility.
Oppo A77 4G is one of the best smartphones on the market. The phone is able enough to attract anybody with its features. But it is a matter of sorrow that the phone is not waterproof. You must use a waterproof case to protect it from falling into the water.