Smiling african businessman using smart phone standing in office

text messaging mobile app smart phone portable information device using phone social media modern entrepreneur wireless technology african ethnicity communication african-american ethnicity mobile phone technology businessman men professional occupation internet employee letter - document film - moving image corporate business occupation student business office one person people looking place of work manager choosing 4k resolution equipment working telephone smiling concepts studying only men holding horizontal ethnicity human hand lifestyles adult adults only one man only non us film location happiness digitally generated image hand human body part russia