Why does my iPhone 4 keep dropping Wi-Fi?

For the last couple of months, my iPhone 4 has started dropping Wi-Fi even when I'm sitting near the router. I've had it for almost 2 yrs. What causes this?

Added (1). I've had an android phone… Hate the market, and the whole set up. All I was needing to know is how to fix it or if I'm better off using my upgrade for a 4s or 5.

Cause its an iPhone.upgrade to a droid phone friend.

Because it hates you. Lol jk. Try putting it on airplane mode.

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