The Nokia Eseries consists of business-oriented smartphones running Symbian OS, with emphasis on enhanced connectivity and support for corporate e-mail push services, as well as enterprise-styled products and many featuring QWERTY keyboards. All devices have advanced office features through its S60 platform. Phones equipped with Wireless LAN also provide a VoIP client. Throughout the series' lifetime its main competitors were BlackBerry products from Research In Motion. The Eseries was marketed until 2011.

BlackBerry was a brand of smartphones and other related mobile services and devices. The line was originally developed and maintained by the Canadian company BlackBerry Limited from 1999 to 2016, after which it was licensed to various companies.