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it will install this app called Cydia which you'll get lots of cool stuff from but some of the things you might install from Cydia could effect your idevice (your iPhone) it could make it better or worse but there is mainly no problems, but if you want to remove it ; the best thing to do is a restore using iTunes
What else can I help you with?
How do you customize your iPhone?
By jailbreaking it.
What voids your iPhone warranty?
Jailbreaking will void your iPhone's warranty.
How do you get a text file on your iPhone?
You cant without jailbreaking it.
How much does it cost to jailbreak your iphone?
Jailbreaking is free.
Does jailbreaking your iPhone break it?
Yes and it works pretty well for me
Is jailbreaking iPhone legal in Australia?
yes it is absolutely legal
What is the bad side to jailbreaking?
slows down ipod/iphone/ipadpossibility of bricking it (rendering it unuseable)its illegal to use pirated contentDefiantly voids warranty
Is jailbreaking an iphone illegal in every country?
Jailbreaking a phone is partially legal and partially illegal. I have a post regarding this http://www.techlucid.com/2013/11/is-jailbreaking-illegal-or-not/
Is it okay to jailbreak a iPhone 3g?
It is okay to jailbreak your iPhone 3g. The only downside to jailbreaking your iPhone is that you will loose your Apple warranty.
Can you download barrel in iPhone 4S from Cydia without jailbreaking?
No. Sorry.
Can you play halo on iPhone 4S?
Yes by jailbreaking your apple device
Is jailbreaking a iPhone legal or illegal?
It is not illegal but will invalidate any warranty.
