My iPhone won't connect to my Wi-Fi? - 1

My iPhone 4S internet won't work when connected to my Wi-Fi.
My Wi-Fi is definitely working because I'm using it now, and other people in my house have had no problems at all with it.
Over the past 2 days, my iPhone has said that it's connected to Wi-Fi but when it's "connected" iMessenger, Safari and other apps that use the internet won't work.
What should I do?

Added (1). Also, it doesn't work even when no one else in the house is connected to the internet.

Seeing as though there's a very brief explanation of what is going on, Ill give it a shot.

In the past two days have you either, Changed out your network (new router and/or modem) or suffered from a brief power outage?

If you have, try these tips.

Tips:
1) Go into the network and either reset it, or just set a new password/router name
2) Try inputting the password into your phone again, by going to Settings- Wi-Fi- enter into your wireless Broadcasted Name- input password.

Only two I can think of at the moment, if you can, provide more information. For example: Type of Router, internet provider, whether or not the Iphone is Jailbroken

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