A jailbroken iphone can be compared with a generic iphone. They have different advantages and disadvantages. To jailbreak an iphone can reveal the most ability of its iOS, but most of jailbreak tools are written by untrustworthy hackers. Codes for jailbreak tools should never be examined, so your iphone has risks to be a zombie computer if you jailbreak your iphone. In fact, some happened instances show that a jailbroken iphone can cause threats for users. However, this issue should not cause problems for me because I know existence of this problem. The most important reason is that I have no 3G account since I do not have much money, so my iphone only connects to Internet when it connects to a WIFI AP. At the same time, I am using the iphone. Therefore, I should notice that my iphone has something wrong when my iphone is going to do zombie commands.
Jailbreak actions are declared legal but jailbreak actions disobey Apple's warranty. Your jailbroken iphone has to be restored before requiring Apple's repair. Fortunately, most of jailbreak actions are able to be restored. On the other hand, the reason which jailbreaks an iphone is legal is easy to be understood because you can do anything legally for your stuff even if you burn your iphone.
An iphone with jailbroken should be installed cydia to install 3th-party softwares. Cydia can be treated as apt package manager with GUI because it uses deb packet format. It is very easy to use and very convenient. Actually, cydia likes 3th-party iTunes store due to you can buy applications and softwares by using cydia. However, softwares brought from cydia has almost no warranty which is compared with iTunes store. The applications installed by cydia brings less stability then Apple's official applications do. Again, the applications installed by cydia have opportunities to be malicious. At least, I do not think that trusting cydia is good.
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