...iPhone 7 being the first example.
No, iPhone 7 is certainly not the first example of a multi-camera phone. There have been several multi-sensor phones, this year both Huawei (P9) and LG (G5) were launched with such. In an article on these devices it is noted that 'Apple's iPhone 7 Plus is rumored to be following their lead later this year'. Correct, Apple did follow their lead, especially Huawei's as the P9 does just what is described in the article: it uses multiple sensors to increase image quality.http://www.theverge.com/2016/4/11/11406098/lg-g5-huawei-p9-t...
Please don't perpetuate this myth of Apple being first with such and so. As a rule they are not first with anything, instead they see what others are doing and produce their own version of the idea. A refined version often, but that does not make it the first version.