Some historic analogies about global impact:
I think that the global impact of using mobile devices in our age is equal the global impact of using Silk Road in ancient and medieval times. This ancient global
network (Silk Road) was also "...used by conquering armies, Buddhist missionaries traveling from India to China, and Muslim clerics from the Middle East." (
http://www.britannica.com/EBchecked/topic/544491/Silk-Road). In other words, not only for trade, but also for sharing information and education. For example, "...China also received Nestorian Christianity and Buddhism (from India) via the road." I think that first of all China received new knowledge via the road.
If Internet (infrastructure) is Silk Road (infrastructure) then information is "silk", mobile devices are camels of caravan, mobile teachers and learners are Buddhist missionaries and Muslim clerics.