By the latest count of the International Telecommunication Union (ITU), the UN agency for IT and communications technology (ICT), the world's roughly 7 billion people were connected via 6.9 billion cellular subscriptions in 2014 ("Key 2005-2014 ICT Data for the World," published by ITU). The developed world accounts for 5.4 billion devices, and the developing world 1.4 billion. Regardless of the uneven distribution, the device density suggested by ITU's statistics is astounding. Inevitably, the electromagnetic transmissions from hundreds of smartphones will come in close contact and possibly clash with one another.
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