Realme unveiled the Realme Ultra phone concept at MWC 2025, featuring a mount system for interchangeable camera lenses.The concept aims to revolutionize mobile photography with a pocket-sized device allowing lens swapping on the go.The Realme Ultra concept bears a resemblance to Xiaomi 15 Ultra, featuring main and wide-angle cameras with 1-inch sensors.The design, though ambitious, appears clunky with oversized lenses and some usability issues in the hands-on reviews.Swapping lenses involves installing an adapter and attaching lenses like the 3x portrait lens and the massive 10x telephoto lens.Manual control over focus and aperture rings sets Realme Ultra concept apart, offering pro-level photography possibilities.The concept works with a standard M lens mount, potentially allowing compatibility with other lenses, but software optimization may be a challenge.Xiaomi's Modular Optical System, another concept showcased, offers sensor-equipped lenses for improved performance but limits lens options.Realme Ultra concept faces challenges in becoming a market-ready product due to setup issues and design refinements needed.Despite its imperfections, the Realme Ultra concept shows promise in enhancing smartphone photography and may lead to future innovations in the field.