Persistent growth in the use of smart phones, plus the adoption of wireless wearable devices and will cause the total amount of Global wireless data traffic is expected to rise by 10 times its current levels by 2019, according to a forecast by networking giant Cisco Systems out today. The forecast, which Cisco calls its Visual Networking Index, is based in part on the growth of wireless traffic during 2014, which Cisco says reached 30 exabytes, the equivalent of 30 billion gigabytes.