A Global Trade Item Number is a number that uniquely identifies a product. You see them beneath the barcodes on almost every product in the world. Which is why they’re often called ‘barcode numbers’. In the UK and Europe they’re usually 13 digits long, in the US 12. You might see shorter 8 digit numbers, used on smaller products.
Analysis of SIM card numbers. All mobile phone SIM cards have each been assigned a unique SIM card number. Below you can enter a SIM card number to check its validity as well as find out more about the mobile network that issued the chip.