almost unusable wifi (IPHONE 3G)

i have got iphone 3g, , wifi signal on awful.

dont know how post screenshots or show you, tiny dont on signal chart, cant connect hardly websites, etc.

, top off, have blackberry 9300 in same room has perfect wifi connectivity, why can blackberry such connection iphone has 0 signal strength?

appreciated blackberry sold , ill left iphone cant connect

thanks.

here's picture of wifi connection, dont know if can see bottom of signal chart

 

i had 2 3g's wifi went out/worked intermitently. it's hardware.

 

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