Jailbreak is some kind of hack that make the users able to gain access to places of the iOS device that users aren’t supposed to mess with. Typically, this is something that makes you able to install cool apps, work with another cellular network, or both, its your choice.
Through jailbreaking, you will be able to add more applications to your iPhone, it allows you to do so by using an application called Cydia on your iPhone, It also allows you to change your iPhone application icons, keyboard, dock, status bar, weather, backgrounds, chat bubbles, wallpaper, etc.
Briefly, if you jailbreak your iPhone it means that you will free it from most of the limitations, weather that's AT&T or Verizon, and Apple. In general, the way it works is like this:
You just install a software on your computer, transfer it to your iPhone and then it will “break open” the iPhone system to allow you to modify it and do system changes.
Jailbreak will let you do almost everything you want, from changing the look of your iPhone to installing all kinds of third-party applications and customized ringtones on it. It also Depends on how far you're willing to go in order to see more features, you can do even more than that: Jailbreaking your iPhone lets you unlock your phone so you can use it with another carrier, not from the one you bought it.
There are tons of third-party apps available after you will jailbreak your phone. Many of them really fun, cool and useful. Of course, many of them are also appear on the regular appstore, but there are also many apps that appear only after you jailbreak your iphone.
There are two types of jailbreak, a tethered jailbreak and untethered jailbreak.
A tethered jailbreak works in a way that every time your device iPhone reboots — for example, if the battery dies — users have to connect (tether) the iPhone back to the computer that runs a jailbreak application, which will help the iPhone to boot up and still be jailbroken.
Tethered jailbreaks are frustrating because they always require connecting your device to computer in order to boot a jailbroken iOS device. Tethered jailbreak has been around for a long time, but briefly it means this: every time your iOS device reboots or the battery dies, you have to connect (tether) your iOS device your computer so that the iOS hardware will be able to boot with the help of the jailbreak application.
An untethered jailbreak doesn't need any connection to your computer in order to restart the iOS device. You can restart your iOS device in a regular way, just as you would do for any iOS device without any jailbreak.
As you can understand, an untethered jailbreak is the preferred type of jailbreak because it doesn't require any connection to your computer except for the initial jailbreaking process. You can restart your iOS device without having to worry about connecting your device to the computer. In case the battery is empty on a device that has an untethered jailbreak, it’s not a big deal, you just have to charge it and it will work as usual. This is how most of the modern jailbreaks work.
Jailbreaking your iOS device cancels the warranty on your device. Apple will not agree to help users who have jailbroken their iPhone, iPad or iPod.
So you have jailbroken your device and you want to know what is Cydia
Cydia is an alternative app store that offers apps that you can't find in the official app store. The apps that offered in Cydia are often apps that have been rejected by Apple because they violate Apple's terms or just because that they compete with Apple's own apps. In addition, there are some apps available at Cydia that may also let users do thing that Apple doesn't want them to do.
Where to download it
In the process of jailbreaking your device, it will often include the option to install Cydia. This is true for a jailbreak tool such as JailBreakMe for example.
Cydia can also be installed via Installer.app/AppTap.
So What Kind of Apps Does Cydia Have?
The apps that available in Cydia do things that are impossible to do through the regular app store:
• * Emulators for video game consoles.
• * Bypassing Apple’s ringtones editor to create your own.
• * Themes to customize the look of your device.
• * Changing the OS’s interface and flow.
• * Downloading files directly to the iPhone, iPod touch, or iPad.
Are Cydia Apps Free or Cost Money?
Exactly as in the official App Store, some of the apps are free and some paid apps. The paid apps cost anywhere from US$0.99 to $20 or more.
How do I pay for Cydia Apps?
You can't pay for Cydia apps with your iTunes account. It only works for buying things through the regular iTunes store. In order to buy apps through Cydia, you need to use Amazon Payments, PayPal or with your credit card.
Are Cydia Apps Safe for use?
One of the ways that Apple selects which apps will be in their app store and which won't, is by checking the code of the app in order to see if there are some problems that may harm the users of the app. Cydia doesn’t do this kind of in-depth checking before they are offered to users.
Knowing this information, you need to understand that when installing apps from Cydia, you are doing it at your own risk and apple will not help you if you will suffer from a problem that occurred by apps from cydia.
What are the similarities and differences between Cydia and Apple's app store?
Both of them similar in many ways, but in one important they are different. Apple's App Store stores all the apps it sells on Apple's servers and you download them from there. Cydia, however, is more like a directory than a store in the way the App Store is. So, in conclusion, When you decide to download apps from Cydia, the download doesn't come from Cydia servers, but rather from storage provided by the ones who created that app.