Hello,
Im choosing a new mobile phone from theese 3 smartphones (galaxy s vs desire vs iphone 4).
I need good music player, good gps, fast and good functionality, internet browsing.
I like samsung, but i heard that galaxy S lags, and gps lags. Is samsungs lags fixible ?
And what is the best choice from these smartphones ?

And one more thing. I now that you can jailbreak iphone and install and you can install a expensive programs(like gps and etc) for free. So can i install pr programs for free on android ?

Galaxy S or Desire.... Galaxy S is the answer ..and ya the lag can be fixed ..AFAIK the lag fix update s already out...yea u can install anything and everything in Android..yea...ahem stuffs too;)

And iPhone 4 vs Samsung Galaxy S
Am leaving that to experts ...because I don't have first hand experience with iPhone 4 :(