The original product name / codename “twttr” was inspired by Flickr and the fact that American SMS shortcodes are five characters. We prototyped with “89887″ as our shortcode. We later changed to “40404″ for ease of use and memorability. Twttr probably had about 50 users in the long code days.
Tja, so einfach geht dat, einfach Nummern eintippen und die passenden Buchstaben ablesen;)