I've been looking at this also. I have an aliexpress special trail camera with 3G that I haven't used yet.
I started googling data-specific SIM card plans for IOT (Internet of things) devices. Discovered Hologram.io - they have SIM cards that work on Vodafone/2degrees network, and costs pennies vs a prepay data plan with any of the main telco companies here. I have 2 SIM cards on the way, both spoken for sorry.
https://hologram.io/pricing/
Depending on how many pictures your camera sends, and what resolution, a 500MB/$19/month plan may be more economical. I intend to have my camera take photos etc, but only send them back to me when I send the camera a text message telling it to do so.
Will keep this thread updated.
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