The United States has outstanding LTE coverage compared to other markets, however worldwide carriers are beginning to upgrade their networks to deliver the high-speed wireless technology to their customers. According to a new report from ABI Research, the total mobile data traffic for 2012 amounted to 13,412 petabytes, an increase of 69% from 2011 when 3G data usage accounted for 46% of all traffic. The accelerated adoption of 4G LTE is expected to increase in 2013, however. The research firm estimates that LTE data traffic will grow an astonishing 207% year-over-year in 2013, compared to 99% growth for 3G traffic. The increase for LTE traffic comes as a result of added 4G deployments in developed markets throughout the world. There are still a number of markets that have not yet upgraded to the technology, though.