A smartphone is a mobile phone with highly advanced features. A typical smartphone has a high-resolution touch screen display, WiFi connectivity, Web browsing capabilities, and the ability to accept sophisticated applications. The majority of these devices run on any of these popular mobile operating systems: Android, Symbian, iOS, BlackBerry OS and Windows Mobile.
Techopedia explains Smartphone
A smartphone is expected to have a more powerful CPU, more storage space, more RAM, greater connectivity options and larger screen than a regular cell phone.
High-end smartphones now run on processors with high processing speeds coupled with low power consumptions. That means, they’ll allow you to play 3D games, browse the Web, update your Facebook account, call, and text much longer than you used to.