JAILBREAKING is over rated.It allows access to Cydia app store where there are many apps,free & pay,that can be downloaded.I found that if one is into games & customizing the look of your phone jailbreaking is for you.If you want to improve the performance of the phone I didn't find many apps for that purpose unlike "rooting" of an Android phone which has many tweaks that will speed up the operation of the phone,which is what I hoped jailbreaking of my iPhone 4 would accomplish.I went back to the stock system because I wasn't interested in what Cydia had to offer & also I was reading about a lot of problems people were having after doing a jailbreak.You can try it then go back if you're not interested.