I probably shouldn't mention this here as the testra bot will find it and stop it from occurring, but with a 1c text plan on my telstra mobile, this is all it costs to send messages to family members who have ported from telstra to another carrier.

Wonder if anybody knows how this is happening as it's got me beat, and should add that the same is not true for calls to their mobiles, only text messages. It has been happening for over a year to date.