My iPhone won't detect home Wi-Fi?

My iphone only detects my home Wi-Fi when its right next to the router! If i move 5m away or into another room, BAM. Goes back to 3G.
This is really annoying. I have tried to forget the network and reset all network settings. They don't solve the problem. Any suggestions or information would help greatly.

- Maybe your router has a small coverage area
- Try to restart your router (turn it off, and then turn it back on)
- I think you need to change your router, buy with a wider coverage area

You can try to restart your router and search again.
you can enter your router name automatically followed by the password of it (if required) it should then connect, if not you have entered it wrong or there's a problem with your router

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