Sprint cell phone bill says that I bought a game, but I didn't? + cell

[isaynothing41]

internet problems!? So, I was looking at the bill online and it says that I bought a game for my cell...when I know that I didn't. They charged me like $3.50 for it but I don't want it and don't want to pay for it! What do I do? My dad won't be very happy about that...especially since he just bought me a new cell and texting...

I think that it might of happened when my phone was in my pocket...some button might've gotten pressed to access the internet or something...so how do I block internet connection altogether? So that I don't accidentally press something and get charged?
I'm almost postive that someone else didn't take my phone and buy it...its a possibility that someone who was looking at my phone might've? Maybe? Or my niece sometimes takes my phone to play with it...she might've? But I highly doubt that she could get to that... So...either way I didn't buy it myself and don't want to get charged...