Hello and welcome to the forums - thanks for joining!
When you say internet security, do you mean settings within the phone or you want an app for it?
If you mean an app, then there are a couple of possibilities (Lookout or Avast).
If you mean a setting on the phone, you may be better off checking with other SGS II users in the sub-forum (I have linked all possibilities, as you have not said which version you have - go for the right one for you):
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