The Telstra Casual Plan $40 includes $40 of standard credit, making the plan ideal for light users, who make 10-20 calls a month and send about 20 text messages. The plan is on a no fixed term basis giving you the freedom to leave at any time, and you will need to BYO handset or purchase one outright. Telstra's NextG network is Australia's largest and fastest mobile network, covering 99% of the population.