What is the price of Iphone 6s price in Singapore? Will I get world wide warranty?

Oh the iPhone 6S is actually quite old now (released back in 2015) so Apple has discontinued it and it's no longer sold in official Apple stores! 😅 You'd only find it on platforms like Carousell or Lazada as second-hand units, going for maybe SGD 100–200 depending on condition. Do note that second-hand phones typically come with no warranty, so buy carefully and always test before paying!