What is different between refurbished iPhone 5s verizon and the new iPhone 5s

This summer the refurbished iPhone 5s became very popular in the market. For many years Apple and US carriers sell refurbished smartphones.  We decided to find out what is different between refurbished iPhone 5s verizon and the new iPhone 5s. Refurbished iphone 5s verizon is a previously used smartphones around the world that are factory...