According to ABI Research, 4G subscribers, which include LTE and WiMAX, could exceed 90 million in 2013. A new study from the firm expects migration to HSPA+ technology to begin in early 2010 migration to LTE to begin mid-year 2010. As a result, W-CDMA subscribers, including HSPA users, should approach 720 million by 2013. The sticking point for LTE: "Some operators may not be ready to move on to LTE, as the peak data rates of 100 Mbps downlink and 50 Mbps uplink are achievable only with a 20-megahertz spectrum band," said Hwai Lin Khor, research analyst at ABI Research. "That is a luxury that most operators may not have, and many may be content with the capabilities of HSPA+ or settle for suboptimal LTE data rates with whatever they have at the time." Article