Jio Platforms (JPL), which became India's second-largest company by market value on its public debut Wednesday, posted a 14% increase in net profit to ₹8,387 crore in the September quarter, helped by improving 4G/5G subscriber mix and growth in digital services. Sequentially, profit climbed 8% at the company that completed the country's biggest IPO last week.JPL crossed the 300 million 5G subscribers mark as its overall customer base increased to 542 million.