Depending on where one travels, Telstra's $89/month plan, which can easily be obtained for $69/month through Telstra Chat, is superior.
Free roaming (up to 2GB per month), calls and texts in Argentina, Austria, Bangladesh, Belarus, Belgium, Brazil, Brunei, Bulgaria, Cambodia, Canada, Chile, China, Colombia, Croatia, Cyprus, Czech Republic, Denmark, Ecuador, Egypt, Estonia, Fiji, Finland, France, Germany, Greece, Guatemala, Hong Kong, Hungary, India, Indonesia, Ireland, Israel, Italy, Japan, Laos, Latvia, Lithuania, Luxembourg, Macau, Macedonia, Malaysia, Mexico, Nauru, Netherlands, New Zealand, Norway, Papua New Guinea, Philippines, Poland, Portugal, Qatar, Romania, Russia, Saudi Arabia, Serbia, Singapore, Slovak Rep, Slovenia, Solomon Islands, South Africa, South Korea, Spain, Sri Lanka, Sweden, Switzerland, Taiwan, Thailand, Turkey, Ukraine, UAE, UK, USA, Uruguay, Vanuatu, Vietnam
https://www.telstra.com.au/content/dam/tcom/personal/mobile-phones/pdf/mobile-byo-plans.pdf