How to fix my jailbroken iphone3g?

I havethe iPhone 3G. I had been unlocked and jailbroken and was on straighttalk. I was able to download apps, set wallpaper and everything but I accidentally reset it and now I can't do anything but talk, text, use the Internet, and download the few apps that are still available for the 3G. What should I do in order to fix it back the way it was? If I have it jailbroken again will that fix it?

Take it to a phone specialist, that shady guy on craiglist

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