IPhone isn't connecting to Wi-Fi? - 1

Hi well my iphone isn't connecting to my home Wi-Fi connection. When I enter the Wi-Fi password it says it's incorrect and my Wi-Fi works on other things like ipad, laptop etc. And it is the correct password also cuz I checked on my ipad. I tried turning off Wi-Fi and the phone itself but it doesn't work, how can I fix this?

Method I

1.un plug modem and wireless router.
2.plug in modem and wait for 2 minutes.
3.plug in wireless router and wait for 2 minutes.
4. Check in any other device whether you are able to access internet via Wi-Fi.
5. Now try to connect iPhone via Wi-Fi.

Method II

1. Reset network settings. Touch Settings -> General -> Reset -> Reset Network Settings.

2. Still having problems? Touch Settings -> General -> Reset -> Reset All Settings. Warning: You will loose all of your preferences.

Method III ( iPhone 5 )

1. Entering manual DNS settings has been reported to help. Navigate to Settings -> Wi-Fi and touch the blue arrow next to your connected Wi-Fi network. Touch DNS and enter Google's DNS server address (either 8.8.4.4 or 8.8.8.8).

2. Router compatibility issues could mean that WPA2 Personal W-Fi security is causing the problem. Switching to WEP security or removing password security altogether can improve Wi-Fi speeds and connectivity.

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