Mobile Virtual Network Operator (MVNO) Market By Subscriber (Consumer, Enterprise), By Service Type (Postpaid, Prepaid), By Operational Model (Service Operator, Reseller, Full MVNO), By Business Model (International/Roaming, Discount, Business, Ethnic, Specialist Data, Youth/Media, Bundled), and by Region; Global Insights & Forecast (2024 – 2030)