I have iPhone 4. I'm suffering from terrible Wi-Fi problem?

Problem is that whenever I'm near to router or wherever signal reception is excellent, Wi-Fi constantly disconnects and sometimes my phone don't search that network. This is not the issue with my router, I have tried it with different routers and internet connections, with different settings but no luck. I have reset network settings, I have installed new firmware but no luck. However my Wi-Fi works perfect is I see two signals on my connection. Like far from router.

The problem is you have an iPhone.

Try backing up and restoring your phone with iTunes on your computer.

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