Apple's iPhone 4 most traded-in smartphone of 2013 Samsung's Galaxy S3 and S2 i900 followed in second and third place, whilst the iPhone 4S (16GB), 5 (16GB), 3GS (16GB) and 4 (8GB) also made appearances in the top 10. Apple's iPad 2 (WiFi, 16GB model) was the top traded-in tablet of last year, making up 9.3 per cent of exchanged tablets. In fact, eight of the top 10 traded-in tablets were iPads, averaging 74.16 per cent of the sector, with cameo appearances from the Galaxy Tab 2 10.1 in second position and the Nexus 7 (16GB) in sixth. High trade-in monetary value and increasing memory capacity in newer models is likely to be the reason behind such a high trade-in rate for Apple devices. However BlackBerry Z10, which was worth £315 in the January of 2013, averaged only £100 by December - a depreciation of £215. Samsung's Galaxy S4's value fell by £161 throughout the course of the year, from £406 to £245. The data compiled by comparemymobile.com also found six of the top ten mobile phones with the highest trade-in values were devices released that year, with BlackBerry's Porsche Design P9981 model offering the highest trade-in value at £500. Due to this particularly high value, BlackBerry was the top brand in offering the highest value for a smartphone, followed by Apple with a highest price of £480 and Samsung with £406. Motorola owners may be left disappointed, after their handsets only attracted a high of £151.