An iPhone can function better if the owner has the full control of it. iPhones are usually locked with a service provider making it hard to manipulate services. Some service providers are even strict and costly. It made an iPhone experience not maximized in a way it is expected to be. Because of this some service providers offer unlocking solutions.
Before you go for the top effective unlocking solutions, you have to understand that there are already factory unlocked iPhones. It is manufactured with a removal GSM card that you can replace anytime you want so there is no need to unlock it. However, when you have an unlocked iPhone you can opt to any of these methods of unlocking an iPhone.
Downloadable Software- There are many free downloadable softwares that will help you unlock an iPhone. "iUnlock” developed by iPhone Dev Team has been widely spread online for 100% free. The software ensures that your iPhone will be unlocked forever allowing you to use other Sim Cards. It is not a hardware unlock so it will not need opening of the iPhone. There are other downloadable software that has been developed by iPhoneSIMfree and UniquePhones. However, using a downloadable free software can be dangerous and risky. There are some software that will pose damage to the operating system of the iPhone. Also, this type of unlocking solution often don't guarantee that your iPhone will be unlocked for good or any specifications that it will function as an unlocked iPhone.