Display
The Siemens AF51 comes with a primary CSTN display that supports 65K colors, with a resolution of 130 x 130 pixels. This square-shaped screen is small by modern standards but was typical for devices in its class during its launch year. The display quality is decent for basic tasks like reading text messages and viewing incoming call notifications. Additionally, it features a second external CSTN display with a resolution of 96 x 64 pixels, allowing users to view time, date, and caller information without opening the phone. This feature enhances user convenience and maintains battery efficiency.