Audio and Connectivity
For audio, the Siemens U10 is equipped with a loudspeaker and supports downloadable monophonic ringtones to customize alerts. However, it does not feature a 3.5mm headphone jack, which means users either relied on the phone’s loudspeaker or a proprietary solution for personal listening. Connectivity options include Bluetooth and an infrared port, supporting wireless data exchange typical for the period. Notably, it lacks WLAN and GPS features, reflecting the era's technological limitations.