Why is my iphone from sprint is so slow?

I decided to jailbreak my iphone, but then i restored it for accident and the version was 6.0 and it started to be really slow. Why is that? Do i need to jailbreak it again to be fast? It was a sprint with a 3G network

Because sprint= slow. Also iphone= junk.

Jailbreak will not make the iphone faster.

Because you jailbroke it and it would make it slower.jailbreak it won't change the speed.

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