Zack from JerryRigEverything set out to find out what's behind the circular camera island on the OnePlus 7T. It turns out that the answer is "aesthetics" as there's nothing inherently circular about the hardware inside. The triple camera module is laid out horizontally with the dual LED flash placed on a separate daughter board (which also houses the NFC antenna). The more interesting finding is that there are numerous rubber gaskets around all openings of the phone as well as around the connections of the ribbon cables. The gaskets are OnePlus red, a nice touch. However, OnePlus...
Source: https://www.gsmarena.com/oneplus_7t_teardown_shows_whats_behind_the_round_camera_plenty_of_rubber_gaskets-news-39775.php
