Refurbished phones are not just second hand phones that have been overly used and damaged over time. Refurbished devices are simply just phones that may have been returned to a manufacturer by a customer so that they can upgrade their device and they have then been repaired and sold on with a new lease of life.
Many refurbished devices work just the same way a new phone would and it is quite difficult to tell the difference between a renewed phone and a brand new model.