Investor’s Business Daily – Video downloads now make up the bulk of data transfers on mobile networks, with one researcher estimating that users watching videos on Apple’s (NASDAQ:AAPL – News) iPhone are generating 58% of mobile data traffic. Bytemobile, a traffic-management provider, said that about 90% of mobile data traffic is generated by 10% of users. Wireless carriers are struggling to meet the higher demand, with some introducing tiered pricing to bill the heaviest users more. Apple fell 1.5% to 315.32.