Is you router near a computer, so that you can log into it and check the wi-fi signal strength of the different devices connected? If you can, then leave your phone in your room where you would like it to get better wi-fi, and try re-orienting the router's antennas or moving the router around to see if the wi-fi to your phone improves at all. This may have an adverse affect on other devices that rely on the wi-fi though.
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