Casio
Cassiopia E-707

The Casio Cassiopeia E-707 was a Japanese-market-exclusive version of Casio’s popular Pocket PC lineup for NTT Docomo, a Japanese mobile network operator. Most notably, it used the proprietary "DoPa" wireless technology, a pioneering packet-switched data network NTT Docomo developed in Japan on top of its PDC (Personal Digital Cellular) 2G network standard. Announced in late 2000 and rolled out to corporate users in early 2001. Unlike the internationally released Cassiopeia E-115 or E-125, the E-707 featured a built-in wireless packet communications module and a distinct external antenna protruding from the top corner. This integrated radio let corporate users securely access company networks, email, and the internet without snap-on modems, wired PC syncs, or bulky expansion sleeves. The device ran on Microsoft's Pocket PC operating system and used Casio's HAST (Hyper Amorphous Silicon TFT) colour LCD. At the time, Casio's screens were widely admired for their bright, vivid 65,536-colour output, far superior to rival passive-matrix displays. Notably, the E-707 offered innovative storage and expansion capabilities, featuring both an SD (Secure Digital/MultiMediaCard) card slot and a CompactFlash (CF) Type II slot. This dual-slot configuration made it a useful device for business users who needed to manage large databases, back up files, or install custom corporate software. Although the E-707 was never released outside Japan, its "all-in-one" wireless approach and focus on secure, packet-switched corporate data helped shape the evolution of future smartphones.