To get root access on my phone I copied one file to the device. It's the "su" binary. At this point the phone is "rooted" although nothing has changed. There is no harm in the existence of this SuperUser command but how it's used that is dangerous. I don't recommend installing a custom ROM because it will surely void your warranty and some features may no longer work. My phone will not be able to operate in 4G mode without the stock ROM.
I originally installed the super user powers because there was an annoying sound that I could not stop. I looked through all the menus and did some research only to find that there is no way to turn the sound off. So I went in with my SuperUser powers and I deleted the sound file itself. The phone still tries to play it but there is nothing to play.
I think that a savvy user should have full rights to change all parts of their device. This is a big factor in my choice to buy in to the Android platform. If it wasn't so free and open I might not be interested anymore.
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