Global Carrier Billing Market By Content Type (Gaming, Video-on-Demand / OTT, Music and Audio Streaming), By Device Platform (Android Smartphones, iOS /iPadOS Devices), By Payment Flow (One-off (event-based), Subscription / Recurring), By Operator Type (Mobile Network Operators (MNOs), Mobile Virtual Network Operators (MVNOs)), By End-User Segment (Banked Consumers, Unbanked / Under-banked Consumers), By Regional Analysis, Global Trends and Opportunity, Future Outlook By 2025-2035