They have long been a common sight at shops in the heartland.
But it seems the popularity of cheap second-hand mobile phones is starting to wane.
Sales of used handsets - especially lower-end varieties - have dropped in the last few years as new models become more affordable, small retailers told The Straits Times.
The decline comes despite customers in Singapore changing mobile phones ever more frequently - as often as every 12 months, according to a study by market research firm GfK.
With each upgrade, consumers hooked on the "mobile lifestyle" are opting for newer, slicker handsets.
In the past, their second-hand phones would have ended up in neighbourhood shops. But with more affordable new models on offer, consumers here are increasingly reluctant to go down the used route.
One shop at Marine Parade Central told The Straits Times that sales of used handsets had dropped "significantly" in the last few years.
Most of the phones traded in by customers here now end up being sold in developing countries such as Indonesia and India, where new models remain prohibitively expensive.
Some second-hand dealers team up with telcos to export their second-hand devices.
Meanwhile, a website called Bounce Mobile aims to help users sell their handsets by handling everything from instant valuations to free home pick-ups.