Iphone 4 network locked
I have tried restoring it on itunes but no change, i have contacted the network it is locked to and they said they have unlocked it but still can connect itunes say there is a problem with your iphone
iPhone 4, iOS 7.1.2
It sounds like you are on the right path. The carrier unlocks the iPhone if they offer that service, then you restore in iTunes. Please expand a little on the error you are receiving when you try to restore. Otherwise, go to https://getsupport.apple.com/
How to unlock your iPhone for use with another carrier - Apple Support