You can find your smart meter number at the bottom of the display, just below the barcode.
This number is unique and identifies your meter. It consists of:
several digits
three letters indicating the brand
For example: 1SAG3105039523 (for a Sagemcom-Siconia electricity meter)
Be careful! Do not confuse your meter number with your EAN code, which is a unique numerical combination used to identify a connection to the electricity or gas network.