As soon as a person stops using their iPhone, it is pretty much a waste of money if it is not being sold. The good news is that iPhones usually do a pretty good job of holding value, so people should be looking to sell their phone online or in person.
There are a lot of different ways to sell iPhone in Singapore, or any country for that matter. It just comes down to finding the method that works best for an individual. Some people want to meet up with somebody who is purchasing the phone, while others just want to get the most money available.
It makes sense for a lot of people to just go ahead and list something online. It really does not take that much time, and the phone can be sold in a matter of hours if it is priced correctly.