It also offers FaceTime video calling, Retina display, a 5-megapixel camera with LED flash and HD video recording.
Vodafone will launch iPhone 4 in the UK on June 24, with sign up already available here.
Meanwhile, Apple CEO Steve Jobs called it “the biggest leap since the original iPhone.”
“FaceTime video calling sets a new standard for mobile communication, and our new Retina display is the highest resolution display ever in a phone, with text looking like it does on a fine printed page,” Jobs said at the launch. “We have been dreaming about both of these breakthroughs for decades.”
Jobs said iPhone 4 will also offer up to 40 per cent longer talk time.