Iphone 4 won't stay connected to my Wi-Fi?

I bought a iphone 4 from a person so it wasn't through my phone company (at&t) i had a iphone 3… I've used all my data for this month and its because my cellular data 3g was turned on. My iphone will not stay connected to my Wi-Fi. Its only at my house when it does this

You need to make your home Wi-Fi he automatic network. What's probably happening is the automatic network that your phone is connecting to is weak. Go to setting then Wi-Fi and connect to your house network. There you should do something that will show a symbol next to your home network. This symbol means that your phone will look for this network all the time. To check you can go into settings when you re enter your house and the phone should say connected.

If the automatic thing doesn't work then your Wi-Fi may be weak or in need of a password.

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