Storage and Memory
Setting itself apart from many competitors, the Siemens SL45i became noteworthy for its inclusion of an MMC card slot with a 32 MB card included. This was cutting-edge because it allowed users to expand memory, primarily to store MP3 music files, distinguishing it as one of the first phones with an MP3 player. The phonebook capacity was practical, accommodating up to 500 contacts, each with 14 fields, which was impressive for personal or even small-business use. In addition, it could store up to 100 SMS messages, which was a significant amount for the time.