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Understanding you travelling in a small group overseas and would like to remain in touch with each other, you will need to use the right country codes. While all may be with Telstra, their mobile services are based in Australia and thus their numbers, as well as your own, is coded as such.
With a Small Business Plan, you can opt for a $10 day pass that provides you with unlimited calls and texts to Australian numbers, whereby you would need to add the +61XXXXXXXXX (remember to drop the zero from the beginning of the number.)
The reason for this is when you are overseas, you will be accessing a partnered network and thus the network will not recognise the Australian numbers without the code in front of it.