Why does when the iphone 4 connects to the internet, the Wi-Fi lags?

Whenever my sisters iphone connects to the internet and i play a online game league of legends for example, i get a very high ping and i start to disconnect and reconnect. Could you help me fix this.

Oh btw, my sister won't get off and shut her iphone down.

Happens to me too. Its probably because the iPhone uses a big part of the bandwidth… I don't think you can do anything, but you may change the routers password so she can't connect… >.

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