Why isn't my iphone staying connected to my Wi-Fi?

I just got an iphone 4. I'm trying to connect to the internet, but I can't because it will not let me stay connected to it without me dropping it's signal. All of my other devices are all 3-barring the internet, but when i'm right next to router ill only be 1 barring it with my iphone.

Try to reinstall firmware bro

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