wiki can explain it better than me but no,it's not illegal.it does however void your warranty but in most cases if you have a warranty issue you can un-jailbreak it before returning it.
every one talks about it, but what is it and isn't it illegal...well according to the sales rep I asked at the istore it is. so what is it and is it legal ? and how dose it make the phone better ?
It's what IPhone and IPad users do to make their devices useful!
I believe Apple would like to make it illegal
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