telecommunications carrier; PTT
sole proprietor; one-man business; self-employed
mobile network operator; MNO; wireless service provider; mobile network carrier
independent power producer; IPP
Telekommunikationsunternehmer
virtueller Netzwerk-Betreiber; virtueller Netzbetreiber; virtueller Mobilfunkbetreiber; (engl.) Mobile Virtual Network Operator; MVNO
general contractor; main contractor