So the current Woolworths special includes the $30 pack for $10. The pack comes with unlimited calls/txts and 2GB data (currently 3GB due to a bonus) for 28 days. It also comes with $5 bonus credit which can be used for roaming, international calls or Premium 19 services.
I'm interested to know if they have any uses which might come in handy and could possibly be used to pay for things like the Telstra Google Play credit can.
Some games take payment by premium SMS.
Otherwise you can donate to charity.
Not with those Optus prepaid though:
Coles not Woolies btw :P