The 2022 Caviar iPhone 13 Pro "Golden Card" edition is considered the most expensive QR code phone, featuring a functional 18K solid gold code for over $35,000. Limited to 19 units, this luxury device enables owners to encode personal data or a digital signature directly onto the device's gold back panel. For more details, visit LetsGoDigital . You can get an iPhone 13 Pro engraved with a gold QR code