How to install cydia or install free apps on iphone 4 without jailbreaking it?

How can i install free apps or cydia on iphone 4 without jailbreaking it. It should be working method. Please confirm that it is safe before giving an answer. The method should be free of cost.don't give any wrong answers.

Forget it. If you don't jailbreak it no free apps and that's it. Jailbreak is safe metod if you know how to do it. So first read about it ant than do it.

Impossible
but you can download the demo is free

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