Hey ,
You have not mentioned the model number of your Samsung mobile. Anyway, the only possible way to get unlock code is from your network provider. But getting the unlock code from the network provider is a difficult task in most of the cases. So you can try getting it from any third party service.
But i don’t think you will get it for free. Even if you get any free offers, I advise you not opt with them. Most of the times free codes are wrong and it may affect your mobile. If you enter over a limited number of wrong codes you have risk to get your mobile hard locked and unusable. So you can choose any paid online service. But be careful in choosing a reliable and an affordable one at the same time. For example you can choose Theunlockspot.com . This is the most safest and reliable online site providing accurate and affordable unlock codes. The unlocking process is very simple here. You will get step by step information on unlocking process from here. You will also get a money