https://www.reuters.com/article/us-samsung-elec-smartphone/samsung-unveils-new-galaxy-phones-to-challenge-apple-foldable-unit-expected-idUSKBN2050DJ >Samsung Electronics unveiled updated versions of its flagship Galaxy S range on Tuesday and is expected to debut a square-shaped foldable smartphone, as the Korean cell phone maker seeks to revive sales after ceding its smartphone crown to Apple Inc last quarter.