Multiple choice general knowledge science & technology The first mobile phone that the user can change cell phone’s casing. Nokia 5100 Nokia 5200 Nokia 4100 Nokia 4200 Reveal answer Fill a bubble to check yourself A Correct answer Explanation Nokia's Xpress-on covers feature was introduced with the 5110 model in 1997, allowing users to customize their phone's appearance. The 5100 series represents this innovation. The 5200, 4100, and 4200 were later models or different series altogether.