The rear camera can't be used to be caused by the rupture of the rear lens. It may also be the damage of the main board caused by water intake, which indirectly affects the rear lens. In short, it is the hardware problem.
If the mobile phone is in Hong Kong, as in insurance, damage to human, can go to customer service warranty. After sales personnel will first test the mobile phone, the main board damage is to change directly.
If the phone is a cargo, you need to add money to replace it. The new price is generally very high, the new machine can not guarantee that the new machine will be guaranteed.
If the phone is a demon machine, black machine, it can not be changed.