“ Originally Posted by UnicyclistRobe 
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What exactly is a Rom? What does it do?
a rom is the operating system. think of your phone as a computer. the operating system you are running is xp or vista and they have different version like home premium, ultimate, etc.... same thing with the rom custom built with apps and changes to the registry to make it perform better..... so basically the rom is how the phones runs and what it runs.