Is there an app to use locked wi-fi on the iPhone WITHOUT Cydia?

I have an iPhone 4s iOS 5.1.1 and I need to use wi-fi. YES I've asked the neighbors their password, and they "forgot" it. I can't really go to any public places, and I don't own a computer to jailbreak my phone to use one from Cydia.So, yeah. Preferably a free app if there's one? Anyone know of any?

No sorry. Only for Cydia. Every app that goes into the app store is checked and because wi-fi hacking is illegal then apple decline the submission of that app.

The standard Wi-Fi app will work. You just need the password.

Being your neighbors won't give you thiers (good for them), you need to get your own home broadband, and wireless router.