The 7 is not the lucky number for smartphones. I bet that you already know the story about Samsung Galaxy Note 7 smartphones which are overheating and literally setting fire. Unfortunately, there is the first report about exploded iPhone 7 Plus mobile. It does not look so bad as in case of Galaxy Note 7, but people over the whole world are already squeamishness at this point.
A Reddit has spotted several photos which present damaged brand new iPhone 7 Plus smartphone. It looks that something really bad has happened between the factory and delivery. The smartphone was not even turned on. However, it could be damaged during the transport. As far as I know, the physical damage should not end up in this way, if the device was switched off all the time. Maybe it accidentally turned on and overheated, because it was closed in the box. Apple is already investigating this case.