?

I was at the android market (on a smart phone - : ) ). A reviewer for a 'real' free app included the web site FreeDroidApps.us as a place to get apps for free that are generally sold for a price. I went to the site and they requested my phone number. That took me to another screen for dating, also asking for my phone number, so I left. I then went to search and at a different screen, directly below that website was Yahoo answers with the question and answer that websites with .us are generally scams and not to go there. Is there anything I can do to undo what I've done (two times - what a sucker I am)? Would immediately downloading a malware or other similar program for my phone be helpful? Thank you.