Translation guide
A company that provides mobile phone services using another carrier's network infrastructure. In Japanese, this is commonly referred to by the English abbreviation MVNO or the full Japanese term.
Referring to a mobile virtual network operator in general
The most common way to refer to a mobile virtual network operator in Japanese, using the English abbreviation. Widely understood in tech and consumer contexts.
Budget SIM cards are provided by MVNOs.
The full Japanese translation, used in formal or technical documents. Less common in everyday conversation.
You need to register as a mobile virtual network operator.