Oppo K1 is the debut offering in a brand-new series from Oppo, which offers an in-display fingerprint sensor at a very affordable price. In fact, the Oppo K1 is currently the cheapest smartphone in the Indian market with an in-display fingerprint sensor, giving it a unique edge over the competition. But is this all Oppo has concentrated on or is the phone a good all-rounder too? Let's find out.