Mobile phone theft has dropped 23 per cent in the three months since Telstra began blocking stolen or lost phones from its network.
More than 10,000 mobiles reported lost or stolen have been blocked from Telstra's network since the introduction of anti-theft technology on August 15.
Telstra Mobile managing director of products, Rick Wakeham said the technology was introduced to "clamp down on the rising tide of mobile phone theft".
It blocks a mobile phone's serial number preventing handsets being used on Telstra's network.
About eight per cent of phones are stolen in the workplace and most phones are reported lost or stolen on Monday suggesting they go missing during the weekend.
More than 1,100 handsets were unblocked at the request of customers after the handset was later found.