How to know if an iPhone 4s running on iOS 6.1.3 is jailbroken?

Before when the 4s was running on iOS 5 i had jailbroken it then Cydia had came later i deleted Cydia. Then when i updated to iOS 6.1.3 everything was gone. Now i wanna update to iOS 7.0.4, but i have to know if it is still jailbroken so that the iPhone won't get formatted.

Just create backup and update, you won't lose anything.

If it has Cydia on the Home screen, it's jailbroken.

Also, there are no jailbreaks for iOS 6.1.3 on iPhone 4S.

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