Why can't I open a webpage?

I have an iPhone 4 with iOS 7.1.2 installed on it.
One day I tried open webpage but Safari gives me this error: Safari can't open the page because your iPhone is not connected to the internet.
But actually my iPhone is connected and even the Wi-Fi sign is right in status bar.
But can't figure out what the problem is.
Please help me out here.
I will appreciate your answer.

1800 Apple

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