Re: what is unlock code for nexus 4 t mobile carrier lock
All phones acquired from a carrier are locked to that carrier. You need your carrier's permission to unlock and they will give you the unlock code to do so. But they won't do it if the phone is still under contract or not fully paid for.
Re: what is unlock code for nexus 4 t mobile carrier lock
If the phone was bought for a subsidized price (less than a couple of hundred dollars), you're paying a little for it each month as part of the bill. They'll give you the code after it's paid for.
As far as what the code is - it's different for each handset - there's no "TMobile Nexus 4 unlock code".