hy I am sorry if I opened this topic to a wrong place, but I really need help.

I have an unlocked Galaxy S, android 2.1 using with Vodafone sim (Hungary)

So I have a prepay sim, with a good choice: I can use Facebook, Twitter and 2 other sites for free.

BUT

now about my problem: if I apply all the network settings Vodafone gave me- to make access to facebook etc- my phone gets free, all the apps wanna go online and sync, like Gmail app, another email app, Gtalk, so everything.

So how can I filter internet access? I only wanna use Opera mini with some of the mentioned sites and block all the other apps.
Any setting or app that can give me chance to select mobile network or wi-fi connection, or simply block all the data transfer expect opera?


I hope someone can help me, so please:)