The OPPO A31 is the perfect smartphone for everyday use. It features a 6.5-inch HD+ display, a powerful octa-core processor, and a long-lasting 5,000 mAh battery. It also has a
From Wikipedia
The Oppo A31 is an entry-level Android smartphone manufactured by Oppo Electronics and released in April 2015 in China. It was the first smartphone part of Oppo's A series lineup.