Sony Xperia Z5 Premium Trade-in Price History
The trade-in price history of Xperia Z5 Premium generally shows a decline. In other words, the used prices of this device are dropping as newer models come to market. It is only very rarely that a second-hand electrical device will increase in price; this usually happens for example if it's a collector's item. Therefore if you are looking to sell your Xperia Z5 Premium then it probably makes sense to do it sooner rather than later - before the next price drop.