Your smartphone generally will come in a box with a sticker on it that includes your serial number, so if you saved the original packaging, that’s one easy way to find it. If you can’t locate it that way, you’ll have to go into the settings. In your phone’s settings, look for an option like “About Device” or “About.”

You can find your TV's serial number on the product sticker attached to the TV and its original packaging. The product sticker should be on the back of your TV. Alternatively, you can access your TV's serial number in your television's settings. In the settings menu, look for an option like “Product Information,” “System Information,” or “About Device.”