I bought a used iPhone 5 today. When I insert a Nano SIM and try to activate it, it says the previous user has locked the phone and that I need to insert a number to get it unlocked.
I bought the phone through an online site olx.com so I am not able to get in touch with the person to get it unlocked.
I hope that the phone was not stolen and sold to me. I have the bill of the phone, the charger, and knowledge that the device is still under warranty.
Any idea on how I can gain access to the device?