An mPOS (mobile point-of-sale) system transforms an iPhone into a payment terminal by connecting to a small card reader via Bluetooth or using a tap-to-pay function. This setup enables businesses to accept contactless, chip & PIN, and swipe payments securely and efficiently. The app often includes sales tracking, invoicing, and integration with accounting tools, making it a powerful all-in-one solution.

Example: A masseur uses an mPOS app on their iPhone to accept card payments instantly after each session. This improves customer convenience and eliminates the need for cash transactions, creating a seamless and professional payment experience.