Nokia 5110: Released in 1998, it was Nokia's first phone to support interchangeable color covers, pioneering mobile phone personalization. It featured a monochrome screen and the iconic external antenna, representing an early era of feature phones. Nokia 3310: Released in 2000, it was renowned for its extreme durability, earning the nickname "unbreakable." It featured an improved antenna design (internal) and enhanced battery life, becoming one of Nokia's best-selling models and holding many users' fond memories. Both phones feature removable batteries and support basic call and text messaging functions. As secondhand collectibles, they retain their original retro look and feel, suitable for nostalgic collecting or as vintage decorations.