History of mobile phones
A cellular telephone switching plan was described by Fluhr and Nussbaum in 1973, and a cellular telephone data signaling system was described in 1977 by Hachenburg et al.
Mobile phone industry in the United States
While it is "mobile phone" in British English, it is "cell phone" in American English. The term "cell phone", short for "cellular phone" came into the day-to-day American English vocabulary during the 1980s when the mobile phone companies had to distinguish their mobile phone that can be carried from one cell to another, each controlled by a land-based antenna, from the earlier Improved Mobile Telephone Service phones. In Wikipedia, "mobile phone" is more often used because it can be used across various technologies.