Bharti Airtel and Vodafone Idea (Vi)’s recent move to hike base postpaid plans for corporate users and base postpaid rates is a clear bid to boost average revenue per user (ARPU). Over the next five to six months, both are likely to target another round of hikes. Analysts, though, say the next round of hikes in the 4G postpaid user segment won’t be easy as Reliance Jio is still after customers.