Something happened to my iPhone?

I have an iPhone 4S and my cousin downloaded an app from one of these websites where you have to change the date and then it downloads (even if its not in the App Store) I had to reset my phone cause my App Store didn't work and it said that there was some kind of hotmail username that was on my phone my cousin accidentally took my phone and pressed accept to the hotmail account I didn't know. I supposed the hotmail account was from that website he was on so I reseted my phone and now I have a diffrent App Store and when I look at the installed apps I got there's a big button. I just took a look at my app sore and it's back to normal. I'm just worried that my phone is wreaked. My cousin got these apps from these sites.http://emu4ios.weebly.com/downloads.html and http://m.coolrom.com/roms/nds/16846/Animal_Crossing_-_Wild_World.php for the second website he pressed the second one that says nds4ios.

You downloaded a hack. Reset your entire phone and see if that works if not go talk to the genius bar at Apple.

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