2013. Collins Bartholomew Ltd. Representation of the area covered by GSM (2G) mobile communications around the world as of December 2013.
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2013. Collins Bartholomew Ltd. Points representing GSM (2G) mobile network operators within particular countries as of December 2013.
2013. Collins Bartholomew Ltd. Representation of the area covered by 3G mobile communications around the world as of December 2013.
2013. Collins Bartholomew Ltd. Points representing 3G mobile network operators within particular countries as of December 2013.
2013. Collins Bartholomew Ltd. Representation of the area covered by 4G mobile communications around the world as of December 2013.
2013. Collins Bartholomew Ltd. Points representing 4G mobile network operators within particular countries as of December 2013.