Nowadays we all need a spare phone to use it when our original phone’s battery dies, and instead of buying a new phone for a spare phone we always go for the second hand options. Devices like second hand laptops and mobiles require testing. Mobile phone testing can be done very easily as we are very handy with this device.
One must check if the data wipe for mobile phone is done or no, before buying any second hand device especially smartphones or laptops be it spare or for main use one has to make sure that they check it completely.
List of things that you must check before buying a used smartphone-
Make sure you check everything before buying the second hand device, check everything including the bills or the phone and how old the phone is.
Do not buy a device which 3 yrs or above old as it is soon going to be out dated or spoilt or both.
Make sure the device you re purchase for spare use is maximum 2 years old only as only than it can last longer.
Source : http://datawipeforlaptop.blogspot.com/2017/05/how-to-check-second-hand-phone-before.html