Insider AppleDemoYT published a short video in which he collected photographs of an unusual iPhone prototype.
He has no physical functions. Instead, they stand with a tactile hand away from the transmission. There is one display combination button rather than a designed and also modified SIM card tray which looks normal and is secured with screws.
One cable inside the smartphone is connected to the charging port, and the other is connected to the buttons on the device. Many elements have plugs and are not connected to anything. The motherboard has the necessary equipment; it is something between the iPhone 13 Pro and iPhone 14 Pro.


Based on the serial number, the device was manufactured in May 2021, which predates the iPhone 13 Pro. The block camera is similar to the one in the iPhone 14 Pro, so this could be it, but the combination of components makes identification difficult.
AppleDemoYT suggests that this feature testing device is not a prototype of a specific iPhone model.
Source: Iphones RU

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