Problem is that whenever I am near to router or wherever signal reception is excellent, wifi 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.
Read more: I have iPhone 4. I am suffering from terrible Wi-Fi problem?