The lock status of your iPhone you will find here:
unlocked : false - that means your iphone is locked
unlocked: true - that means your iphone is not locked (unlocked)
It is very important to check also this point:
nextTetherPolicyDetails:Unlock - that means your iphone is unlocked even when the lock status is "unlocked : false" - that means it is unlocked but not yet connected to iTunes
nextTetherPolicyDetails: AT&T USA (for example) - if it shows specific operator here, that means your phone is locked, in this case to AT&T USA operator
Examples:
1. Your iPhone is unlocked (not locked) and already connected to iTunes (unbricked):
serialNumber : T3113MXXXXX
partDescription : IPHONE 4 16GB BLACK
imeiNumber : 0126490002XXXXX
initialActivationPolicyDetails : UK Hutchison.
initialActivationPolicyID : 303
unlocked : true
unlockDate : 07/03/14
warrantyStatus : Out Of Warranty (No Coverage)
coverageStartDate :
coverageEndDate :
daysRemaining : 0
PurchaseDate : 07/06/11
purchaseCountry : United Kingdom
registrationDate : 07/06/11
productDescription: iPhone 4
nextTetherPolicyID: 303
nextTetherPolicyDetails:UK Hutchison.
appliedActivationPolicyID:303
appliedActivationDetails:UK Hutchison.
unbricked : true
firstUnbrickDate : 08/06/11
lastUnbrickDate : 07/03/14
meid : iccID : 894705951311190XXXXX
productVersion : 7.0.6
macAddress : D89E3FXXXXX
bluetoothMacAddress:
2. Your iPhone is unlocked (not locked) but not yet connected to iTunes (not yet unbricked):
serialNumber : F2LLTCYXXXXX
partDescription : IPHONE 5S 16GB SILVER
imeiNumber : 0138480023XXXXX
initialActivationPolicyDetails : US AT& T Reseller .
Our unlock instructions are the simplest to follow. We only require that you use your keypad to enter your UNLOCK CODE. If you can dial a telephone number, then you can e...