PlayStation Knowledge Center
The PS Vita's model and serial numbers are located on the bottom of the system. You will need these numbers to register your system, and you'll need them when contacting Consumer Service.
The serial number is located to the right of the multi-use port, and consists of nine characters and numbers.
The model number is to the left of the multi-use port, under the barcode. It is seven characters long and will begin with PCH followed by four numbers.
The bar code number is located with the Model Number and is eleven characters before the model nuber. This will be needed when contacting Consumer Service.