30 in depth which if you like the precious iPhone 7 size you will love this iPhone 8 Plus size as well. The dimensions of an iPhone 8 plus are 6.24 ins x 3.07in and. iPhone 8plus design is actually similar to the previous one with changes of a faster processor, wireless charging, and a well-improved camera. Home Button still applies. The iPhone 8 plus launched out September 22, 2017, with the all-new brand new glass back.