Jodi, if anything, jailbreaking or rooting (android) allows you to make your device faster. However, when you unlock a device without having complete knowledge of it, you are opening yourself up for major problems. If you are a pc user, jailbreaking is equivalent to having administrative control, plus some. I suggest you don't do it, or if you do, you do extensive, intensive research. You don't want to end up with a device that is completely unfunctional.
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