Help. How to improve signal coverage on THREE network

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http://androidforums.com – Dear All, I have quite a weak signal / bad coverage at my post code. I read a lot and found one thread on Moneysavingexpert.com which suggest the following solution to improve the signal. It says: Go to the phone dialer and dial *#*#4636#*#* (DO NOT press send or call button) just wait a second and you will get the 'test' menu. In the test menu choose 'Phone Information' scroll down and choose on the first drop down - GSM auto (PRL) (for high speed data) or GSM only (You may get 3g if not use GSM auto (PRL). I have chosen GSM (PRL) setting and it works fine on my HTC desire. Back out to test (General)