A mobile virtual network operator (MVNO) is a wireless communications services provider that does not own the wireless network infrastructure over which it provides services to its customers.
简单来说，借用其他运营商基站的运营商都可以称为虚拟运营商
移动虚拟运营商（Mobile virtual network operator，MVNO）是指不拥有 无线网络基础设施 ，向消费者提供无线通信服务的电信运营商。
简单来说，借用其他运营商基站的运营商都可以称为虚拟运营商
Wikipedia
Mobile virtual network operator
mobile telecommunication operator that doesn't operate its own network