Keen to get iOS4 on your iPhone before Apple officially release it on June 21st? Turns out, with the iOS4 Golden Master (GM) release in the wild - which Apple pushed out to developers after Monday's WWDC keynote - those of us with iPhone 3G or 3GS handsets can now take advantage of the new functionality, and thanks to a little hacking you can also jailbreak an iOS4-running iPhone 3G and enable the custom wallpapers and multitasking Apple don't want you to have.
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