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Anticipation for Apple's latest iPhone has reached fever pitch on the eve of its release tomorrow (June 24).

iPhone 4 is 24% thinner than its predecessor, and includes an enhanced display and stainless steel case.

Demand for the phone has already exceeded forecasters' expectations, with Apple claiming to have received 600,000 pre-orders in 24 hours.

Although the device doesn't go on sale until tomorrow, some online customers have already received their order and reviews have begun to circulate online.

iPhone 4 will be available on O2, Vodafone and Orange, as well sim-free from Apple stores.

The phone also has two cameras - one on the front and one on the back - and will allow users to chat via video over wifi.