hi...i want to modify iPhone..firmware 1.0.2..how can i do it?

Oct 19, 2007
i am very new to iPhone and i just got it..it's unlocked and the firmware is 1.0.2... i want to add some cool softwares such as gps and google maps..and some games possibly..how can i do this? is it possible to download and chance the wall paper?

is there a program do i need to use?

is it true that if i install the 3rd party software that will void the warranty?



p.s i am in canada and there is no at@t service is there way that my iPhone can function like gps in my car? i have fido service in toronto...