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In this Tuesday, April 2, 2019 file photo, Lee Pil-jae, second from right, Vice President at KT Corp., and models introduce various 5G services available on smarpthones during a press conference on 5G service at KT Corp's headquarters in Seoul, South Korea. South Korea's telecommunications carriers on Wednesday, April 3, have turned on super-fast 5G mobile internet networks abruptly ahead of schedule in an attempt to ensure the country becomes the first in the world to launch the services. The signs read: “Play with the world with KT 5G”. (Photo by Ahn Young-joon/AP Photo/File)
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