Apple has released iOS 9.3.5 for its iPhone, iPad and iPod users recently, but this update only focuses on a tiny fix. Apple released iOS 9.3.5 just 3 weeks after releasing 9.3.4 on the 25th of August 2016. This came just weeks before release of iOS 10.
Apple users had waited a long time to download Cydia for iOS 9.3.3. Because of the latest iOS release there is no way to download Cydia iOS 9.3.5. Apple has been against jailbreaking and the usage of Cydia which is one of the reasons Apple released iOS 9.3.4 and 9.3.5 immediately.
Cydia is an application that allows iOS users to handle and tweak their iPhones once it has been jailbroken. Cydia is available for iOS 9.3.3 so it is recommended that you do not update you device to iOS 9.3.4 or 9.3.5. It is recommended to wait for Cydia iOS 9.3.5 update. To read more on Cydia iOS 9.3.5 click here.
The most reliable app that you can use to jailbreak your iDevice is to use Pangu Jailbreak. Pangu is also not available for iOS 9.3.5 yet.
Once you have jailbroken your phone you will have an app on your phone called Cydia. Cydia will allow you to download apps that you can not download in a iDevice that has not been jailbroken. These apps can allow you to customise your homescreen or your ringtones. There are apps that help you clean up your iDevice. There are apps that will help you organise your iDevice like iFile.
Watch this video for the best Cydia tweaks for iOS 9.3.3
To jailbreak your phone you can simply go to the Pangu Jailbreak website on your device and jailbreak from there. Pangu iOS 9.3.5 and Cydia iOS 9.3.5 has not been released yet.