24-07-2018 08:20 PM - edited 24-07-2018 08:22 PM
@Danmay: Where did you buy this phone? What phone is it? What network is it locked to? You will need to go to them.
Or is it an EE phone & you are trying to use it on another network?
24-07-2018 08:47 PM
@Danmay You asked the network provider what the phone is locked to unlock the device but that network will have is own set of rules about how to unlock that device. Ask the person you purchased it from what network it’s locked too.