Samsung galaxy s2 weak network signal

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http://forum.xda-developers.com – Good day all, a friend of mines recently bought an unlocked galaxy s2 online..out of the box the imei number was resetted to the manufacturer's default 0049*** number. I used the samsung srs tool and programmed the correct imei to the phone and it started getting network signal BUT places where I am getting full bars with the same network provider and same galaxy s2, his phone is getting real poor signal or even none. The only way he phone is receiving full bars is areas closest to the cell tower..the only difference in the two phones are the roms..I have the leaked jellybean whereas he has an (HowTos)