, you can unlock your SIM card or even certain applications that you could not use or get before you had your 3g s unlock solutions meet by the website. Some people do not get a good signal in the area that they use their phone the most so they want to change providers but a lot of providers are not capable with the IPhone. Unlocking your SIM may allow you to use the IPhone with service providers that do not support the IPhone, this in the long run can cost you less money and could get you better coverage in your area compared to the current provider for the IPhone