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i have an iphone 3gs with 4.3.5 ios,
I tried to install a custom app thats in its design stages to test it out. When I tried to sync it in itunes I kept getting an error saying: "the signer is not valid"
So I jailbroke my phone and tried it again and I still got the same error.

Do I have to purchase a developer account in order to test the app?