Short Term Prepaid Mobile in the Bush

I am with Optus for my mobile phone as it is cheap and suits 99.9% of my needs when at home.

However we all know it is crap outside the major population centres but certainly in NSW it hasn't been too bad in remote NSW towns - or so I thought.

Was recently in Cobar (phone no data), Wilcannia, Menindee, Pooncarie and Mungo and environs inbetween and had no coverage where there was Telstra all the time.

So for future trips i am going to have to get some sort of Telstra prepaid and divert my Optus number to it.

In addition to phone, I need data (probably) less than 1.5gb as I use the phone as a wifi hotspot for a tablet and laptop. As my trips are less than a month I have been looking at 28-30day prepaid options.

Telstra have a $30 28 day prepaid that has a call allowance that suits me and 1.3gb of data but I know many companies have other plans that may not be advertised and not generally promoted.

So does anyone know of other Telstra plans that might suit my needs.

Thanks

Garry