Second hand iPhone 6S Plus Apple has reinvigorated its phablet with smart 3D Touch technology and more power under the hood. Grab your hands on a? Second hand iPhone 6S Plus. The used iPhone 6S Plus is an upgrade of the previous model the 6 Plus which means there are a few more fancy features you won’t find on older iPhones. The 6S Plus now sports a stronger ‘7000 series aluminium body’. A full HD resolution and 401ppi pixel density making it more sharper. Images and text are crisp and clear with vibrant colours. Apple’s latest innovation, the 3D Touchenables the iPhones to recognise the level of pressure you’re applying to the display, and reacts differently depending on how much force you’re using.