Sound and Connectivity
The Siemens U15 lacks a loudspeaker and 3.5mm headphone jack, which limits its audio output options. However, it does support vibration and polyphonic ringtones, which can be downloaded, allowing users some customization with alert tones. Connectivity options include Bluetooth and an infrared port, facilitating wireless communication, while lacking modern essentials such as WLAN. The inclusion of a proprietary USB port underscores its limitations concerning connectivity and data exchange.