Our hope to see solved the Galaxy S2 signal strenght issue with the 2.3.4 upgrade have been disappointed......in fact thanks to mr. Flat Teddy we knew even though the 2.3.4 update Phono doesn't work properly, in particular as regards the signal strenght....
We knew too there is two open tickets on the google support:
Android code google support
Android dev group
We really hope it will be solved as soon as possible.