Hamburger phones are selling on eBay like hot cakes, after they appeared in the hit comedy movie "Juno".

Hailed by critics as a hilarious yet moving take on teen pregnancy, the film tells the story of 16-year-old Juno MacGuff and her battle with adoption after falling pregnant to her friend Paulie Bleeker. She talks for hours to her high school boyfriend on a hamburger phone.

Juno debuted in Australia on January 17 and while it reportedly only cost about $US10 million to make, it has already garnered over $US110 million in US ticket sales and $7 million in Australia. eBay spokesman Daniel Feiler said in the three months between November 7 and February 5, Australians snapped up 364 hamburger phones. Prices, sales and bids have increased exponentially in the three weeks since the film's local premier. As demand has increased, so too has the final selling price, which inflated from around $10 in November to around $20 in January. Some have paid up to $56.

In the US, eBay said demand for the retro phones jumped 759 per cent in the month following Juno's release there. The 330g device is made out of plastic and can be used as a regular landline house phone. "eBay gives great insight into popular culture," said Feiler.

"When something is popular because of a movie or a TV show or some other pop culture phenomenon, then we do see a reflection on eBay and that's clearly demonstrated by an increase in interest and sales of hamburger phones in the last few weeks of January."

Less than 20 units were sold in November but in December sales spiked to between 15 to 30 a week, before rising to about 50 a week in January. One of the top sites selling these devices for eBay - as an affiliate - is HamburgerPhone.net.