Mr Penn's comments on the importance of customer service comes after a series of damaging network outages this year, including four mobile outages in the space of two months. Addressing those disruptions, he said a review of "every aspect of the network" had been carried out which confirmed its "incredible strength and resilience". Nonetheless, Telstra would improve the network while spending $25 million upgrading network monitoring tools and another $25 million to speed up network recovery time. "Whilst no network operator in the world can guarantee that disruptions won't occur from time to time, what we can do is reduce the likelihood and the impact," Mr Penn said. Investment bank Macquarie upgraded its target price for Telstra shares by 3¢ on Thursday to $5.75 in light of changed expectations for domestic growth that are favourable for telcos.