How do you change your Bluetooth name on an iPhone 12?

You change your Bluetooth name on an iPhone 12 by renaming the phone itself in the "About" section of the Settings app.

Here's a step-by-step guide:

1. Open the Settings app on your iPhone 12.
2. Scroll down and tap on General.
3. Tap on About.
4. Tap on the Name field. It will likely display "iPhone" or your name if you've already set it.
5. Tap the "X" to delete the current name.
6. Enter your desired new name. This is the name other Bluetooth devices will see when your iPhone 12 is discoverable.
7. Tap the About button in the upper left corner to go back, automatically saving the new name. Your Bluetooth name is now changed.