When it comes to buying a second hand electronic gadgets like mobile phones then everyone suggests you not to buy a second hand item. The reason is clear, second hand electronic gadgets have no warranty and you not even know that it is having its original parts or not.
But there is another term which is Refurbished. A refurbished phone is that which is an old device with some minor faults but it is made in original and new condition by removing all its problems. The refurbishment of a device can be done either by the manufacturer ( i.e brand) or by the seller. But remember dont buy a Seller refurbished phone because sellers can cheat on you. But there is no harm in buying a MANUFACTURER REFURBISHED phone because the manufacturers make it all new ones again and provide warranty as they give with a new device and also sell refurbished phones quite cheaper than the new one.
Apple and Samsung has a big refurbished gadgets market outside India. But you can also get a refurbished apple or Samsung phones on Ebay.com.