My main reason is facetime over 3g, folder arrangement tweaks, activator and sbsettings, those are my main factors for jailbreaking, but i have a lot of other tweaks and mods that just change the user experience, the change is very personal and its as simple as having the ios you always wanted, for example, "damnnn i wish i could send more than 5 pictures in an email" , boom, theres a tweak for that. Lots of others examples, youll find tweaks while noticing limitations in ios, much like that picture sending example, I identified the limitation and immediately searched for a tweak and found it, and that happens often. My point is that you can change how you use your phone and make it better or more comfortable. I guess thats all I can say.
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