Mobile Virtual Network Operator (MVNO) Market Expected To Reach USD 73.20 Billion By 2020: Grand View Research, Inc.

Increasing global mobile subscribers and demand for data services is expected to favor market growth over the next six years. MVNOs provide differentiated services to customers by targeting niche market segments such as retail, business, roaming, etc. This helps to avoid direct competition with MNOs and also generates additional revenues for both MVNO and MNO.
http://www.grandviewresearch.com/industry-analysis/mobile-virtual-network-operator-mvno-market