Does slow internet connection interfere with Wi-Fi range?

My brother is home for the holidays. This means that he takes up all the bandwidth with his internet and xbox gaming. I recently got an iphone and I can no longer get Wi-Fi connection in my room (which i was able to do on my ipod touch). My question is: Does the gaming that my brother does affect how far the Wi-Fi reaches in the house or is it something else?

Added (1). I can't even get connection on my couch in my living room which is less than 15 feet away. I have to be sitting at or right next to my computer (where the Wi-Fi tower thing is) to use the Wi-Fi on my phone.

Its your phone.
take it back.

I would try using another device like a laptop or another phone to see if its just yours, if the other devices have the same issue, then its your router, if the other devices connect from a distance, then its your phone.

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