The good thing about Android, is that is an open source project. This means that manufacturers release the open source kernel code that can be further on taken by developers and modified and improved and so on to create Custom ROMs. This is a very big difference from the iOS that Apple uses in their phones.
Just recently, several carriers in the US, among which T-Mobile, US Cellular and Sprint have released their Galaxy Note 2 versions. Immediately there were released the open source kernel files. As a bonus, the Galaxy Rugby Pro from AT&T source kernel was also released.
The open source kernels can be downloaded from opensource.samsung.com. Now developers can overtake them and transform them into real Custom kernels that you can flash at a later time. You get several benefits from a flashed custom kernel, because you get access to several things that carriers usually restrict.
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