You have to call your provider that you have and ask them to unlock your device they will give you a code to enter but your device has to be fully paid for before they will unlock it
If you've found my post to be helpful, Please like my Comments ✓✓✓. If my response resolved your issue, please press the Like and ✓✓✓ to Accept as Solution button.
As previously mentioned... Additionally it may depend on the mobile carrier. For example if your device is eligible to be unlocked and is T-Mobile branded then it has the unlock network option built in. Somewhere in settings then connections...
