Memory and Features
With no card slot for external storage, the D100 focuses on its internal features: a phonebook capable of holding up to 1000 entries with contact group functionality. It can log up to 10 dialed, received, and missed calls. It offers a substantial 700 Kb for MMS, which, while limited, sufficed for the average use case of the era—predominantly text messaging.
Notably absent is a camera, but the D100 did not ignore multimedia completely; it supports downloadable polyphonic ringtones, a fashionable feature back in 2003. The absence of a loudspeaker and a 3.5mm jack means the device relied on its basic sound functionalities geared toward direct communication rather than music playback.