Memory and Storage
One of the standout features of the Siemens SL42 was its memory card slot, supporting MMC cards, with a 16 MB card included. This was a significant enhancement, offering users storage expansion—a rare feature at the time. The phonebook capacity was fairly large, with space for up to 500 contacts, each with 14 information fields. Managing call records was straightforward, as the device kept logs of 10 dialed, received, and missed calls, supplemented by the ability to store 100 SMS messages.