For most models of iPhone, figuring out how to find the serial number is as simple as opening the Settings app.
If you can't turn on your iPhone, you can also get the serial number from the Apple ID web page, or another iOS device using the same Apple ID.
If you saved the original packaging, you can also find the iPhone's serial number on the barcode sticker on the box.
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Every iPhone has a unique serial number, which can be used to identify the specific handset you own.
You may need to know the serial number of your iPhone if you're unlocking it through your carrier, having it serviced, or selling it.