Telstra chairman Craig Dunn has warned that complex regulation could discourage investment. He singled out calls for mandatory mobile roaming, which would let customers use rival networks outside their own provider's coverage. Dunn told a shareholders meeting in Sydney that the measure would not build new towers and could slow further spending. The Australian Competition and Consumer Commission is running a 12-month inquiry into the issue. Telstra's chief executive, Vicki Brady, also accepted an external review's findings on a July nationwide outage, and the board cut executive pay in response.