Queues have already started for those wanting to purchase Apple's iPhone, which goes on sale in the US on Friday.

The phone will go on sale at 6pm on 29 June across the country priced at $499 for 4GB of memory and $599 for 8GB, plus a $36 activation fee.

Running costs are expected to be $60-$100 per month and buyers must sign up for a two-year contract.

In New York some people have been queuing at the Apple Store for three days in temperatures of over 90 degrees to guarantee getting the must-have gadget.

"Against my parents' wishes, I stayed on Fifth Avenue all night last night," wrote David Clayman, the third person in the queue, on his blog. 

"I was only able to sleep for one and a half hours. It's very hard to get shut-eye when bulldozers and trucks are bouncing down the street at all hours of the night."

Clayman said that hygiene was proving to be a problem, but that local companies were sending down T-shirts for those in line.

He was being accused of cheating by some for popping into the Apple store and writing his blog on the computers. Clayman is spending his time chatting to others in line and studying a SAP textbook.

Severe storms are expected to hit New York tonight, which may cool the enthusiasm at 'Camp iPhone', as it is known.