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Foldable 5G smartphones are set to rule the telecommunications world in 2019, as several tech giants unveil their latest products at the ongoing 2019 Mobile World Congress in the Spanish city of Barcelona. Huawei's Mate X with dual external screen that folds out to become an eight-inch tablet is undoubtedly one of the most exciting devices at the annual mobile carnival. Huawei is the world’s first company to launch a foldable 5G smartphone. South Korean tech giant Samsung released the Galaxy Fold a few days ago.