Apple iPhone 15 vs iPhone 15 Pro: What are the rumoured differences?

Apple is expected to announce four new iPhones in September, with the iPhone 15, iPhone 15 Plus, iPhone 15 Pro and iPhone 15 Pro Max or iPhone 15 Pro Ultra all rumoured to make an appearance. There have been several rumours about all four of the models over the last couple of months, giving us a good idea as to what we can expect from the 2023 iPhones.