WebOffline is a tweak that will integrate with your Safari Mobile browser to allow you save complete web pages so that you can visit them when you are offline. Nowadays practically everyone has a data rate, but it may happen that someone does not have it or that you go to a place where you know that there will be no 3G connection and you do not want to be suffering from the slowness of EDGE. Or for example, your data rate is limited and this month you have already exhausted it, because you can download the web via Wi-Fi from home and enjoy it anywhere.
To save a page you just have to go to the bottom bar and press the icon of a crossed-out WiFi signal, then to read them you will have to go to the bookmarks> Saved pages.
You can download it by $ 1,99 on Cydia.
You will find it in the BigBoss repo.
You need to have done the jailbreak.
And this is not done by the factory ios5?