There is a widespread consensus that more spectrum needs to be allocated for mobile broadband. The ITU has forecast a requirement for 1720 MHz by 2020, up from around 300-600MHz assigned today. Many countries in Europe, North America and the Asia Pacific have published targets to increase the amount of spectrum for mobile services by 2020. Much of this spectrum will have to come from other users. To ensure that spectrum release is efficient and generates the expected economic benefits, an assessment of the economic value of spectrum to mobile and the costs of moving incumbents will be necessary.