Telephone sets Cellular telephones 2 ICT 2 Mobile phones 2 Automobile engines 1 Automobile parts and equipment 1 Bipolar junction transistor 1 Bipolar transistors 1 Book reading 1 Car engines 1 Children's books 1 China 1 Communications protocols 1 Computer hardware 1 Computer software 1 Data application 1 Developed countries 1 Developing countries 1 Developing regions 1 E-book collection 1 Endogeneity 1 Entrepreneurship 1 Frequency of use 1 GSM/GPRS 1 GSM/GPRS modem: Wavecom 900/1900 MHz machine-to-machine (M2M) 1 Hardware development 1 Health 1 Human capital 1 Human capitals 1 Human development 1