The number of unique mobile subscribers reached around 5.9 billion globally in the fourth quarter of 2019, representing use of 7.9 billion subscriber identity modules. The global growth rate was about three percent, though varying from zero growth in Europe to 12 percent in Africa.
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NTT researchers recently demonstrated ability to transmit 100 Gbps at 300 GHz frequencies, far beyond the ranges we have used for freespa...
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