A lot vs. Alot: 9 Grammatical Pitfalls
a mobile telephone with extended features as a personal digital assistant, Internet browser, etc.; also written smart phone
In terms of features, most smartphones support full featured email capabilities with the functionality of a complete personal organizer.
a cellular phone offering advanced capabilities, such as a PC-like operating system and Internet access; also written smart phone
There is no agreement in the industry about what a smartphone actually is and definitions have changed over time.