One of our favourite prepaid deals used to be Telstra's Encore Cap deal, since you could use your built-in "recharge credit" to increase the data limits to decent levels without spending extra cash. When Telstra replaced that with the Freedom Cap deal, it took away the option to do that. Now we learn Freedom Cap will get data packs of its own, but you'll have to pay for them up-front.
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Fat Duck Tech reports that the Freedom Cap will soon have its own "Data Top Up Recharges", costing $5 for 250MB or $15 for 1GB. However, you have to pay cash for those: you can't use your recharge credit. Even more annoyingly, the recharges only last for 14 days. So while they might be useful in an emergency, they're not a sensible basis for ongoing purchases.
In that context, arguably the best prepaid deal for the Telstra network remains the Beyond Talk package, which does let you use recharge credit to add data packs without spending extra money. The big downside here is that you won't have a lot of voice credit, outside of the 500 "bonus talk" minutes. But if data matters to you more than calls, it's worth considering. Otherwise, check out our guide to the best prepaid deals on each network.