Ключевые слова: african ethnicity, associate, black, businessman, caucasian, caucasian ethnicity, cellphone, colleagues, communication, connection, desk, dialing, executive, global communication, holding, indoors, male, man, mature adult, mature men, mobile phone, occupation, office, phone, profession, sitting, smartphone, text, text messaging, texting, two people, typing message, wireless technology, workplace, young adult, young men,