In the past month, three fierce smartphone rivals, OnePlus, iQOO and Poco have brought their A-game in the sub-Rs 20,000 price segment. Three new phones have been launched recently — the OnePlus Nord CE 3 Lite, the iQOO Z7 and the Poco X5. As I mentioned at the start, all three smartphones — OnePlus Nord CE 3 Lite, iQOO Z7 …