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Smartphone owners have leapt at the chance to sell handsets pre-loaded with Flappy Bird, the gaming app that became a download sensation before being pulled by its developer.
The game is no longer available to download from the Apple or Google Android online stores, meaning that phones already carrying the app are attracting high prices on eBay, just hours after it was pulled.
One 'Flappy-ready' used iPhone 4 is listed with a Buy It Now price of $450 on eBay, while a 16GB iPhone 5s with the game installed is taking bids of up to $1,200.
A comparable second-hand iPhone 5 without Flappy Bird can be found on eBay for $400 to $500.
Bookmaker Ladbrokes has offered odds of 10/1 on the return of the Flappy Bird app to online stores.
The smartphone game caused an online sensation before being unexpectedly pulled by its developer, but Ladbrokes are also offering evens on its creator Dong Nguyen topping the download charts with another free game in 2014.
Alex Donohue of Ladbrokes said: "Fans of the game may be in a flap but we're betting they'll swoop on Nguyen's next creation."
Smartphone gamers have reacted with shock and dismay at the loss of Flappy Bird, an addictive game which was taken off the Apple App Store and Google's Android Play Store by its developer.
But not all users were sad to see the game go, and others said the game could still be played by people who had already downloaded it to their phone.
The developer of Flappy Bird, currently the most popular free mobile game on Apple App Store and Google's Android Play store, has announced he has taken the game down.
Nguyen Ha Dong - a Hanoi-based game developer - announced the end of the addictive game in a Tweet on Saturday:
Flappy Bird has caused a sensation after rising out of obscurity to become one of the most downloaded mobile games on both Apple and Google's online stores.
Users have to steer a bird between green pipes. The Android version has been downloaded up to 50 million times, and attracted more than half a million reviews.
Dong could not be reached for comment.