This report examines the technical, regulatory and business aspects of VoIP on mobile networks (MVoIP). Itanalyzes the key aspects of the HSPA, HSPA+ and LTE technology and highlights its challenges and opportunities. It evaluates current standardization efforts in 3GPP bodies on IMS and VoLGA and the status of regulatory requirements in different countries. The business impact of each of the technology, standards and regulatory restrictions are presented. A survey of the key players - client and infrastructure - and their offerings are presented. Potential deployment trends are examined based on the current VoIP solutions in the market.