My iPhone 7 Plus is a great travel camera, especially with the addition of a few accessory lenses. My only complaint about using add-on glass with my smartphone is that it can be a pain in the ass to quickly find your lenses or know which one is which when they're stuffed into a traditional camera bag, pocket or backpack. Waterfield Designs seems to have solved this problem with the introduction of their pricey new iPhone Camera Bag. It's not perfect, but it's a significant improvement over every other solution for wrangling iPhone photography gear that I've found so far.
You can check out my review here.