Hi everyone. I've got a 4S and i want to get the next new iPhone in a few months. At the moment, in the UK, an iPhone 4S 16GB is going for around £250/£270 on eBay. I wondered how fast and how far the price usually falls as a new model approaches? So how much would it fall a month from now? And then how much right before the new model is announced. Then how much after the announcement, and so on. I'm trying to see if there's a selling sweep spot where you get the most money whilst having the least time without a decent phone.