try ultra mobile, t-mobile mvno : $59 plan has $20 of international credit (1.5 cents/min to Australiaoor 8 cents/min to mobile), 2 gb 4g data, unlimited sms to these 5 australian operators + free incoming sms:
Pivotel Australia (Satellite)
the cheapest $29 plan has no interantional calling credit but unlimted outgoing + incoming SMS are still included
If you use a smartphone that is iOS or Android based, you can always download apps like Viber or Tango to send SMS and VideoChat over wifi for free.
To use those apps, both party (your DH and person he's calling) must have those apps installed on their smartphone and added each other via contacts book for the app to sync/have permission to import contacts information to the app for you to call/text them for free over wifi, etc
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