Love talking but don't want to be tied down to a contract? A prepaid plan can take care of that.
Why go prepaid for unlimited calls?
These days, most phone plans include unlimited calls & texts (standard, national & mobile). A prepaid plan is ideal because you usually get unlimited calls plus whatever data quota your provider offers, together with complete control over your budget. Because you pay for the service upfront, you can't get hit with any kind of bill shock during your contract period. If you go over your data quota, depending on your provider, you should be able to buy more data or simply coast it out until your next recharge period by using free Wi-Fi services.
As well as keeping you on a budget, there are other situations where prepaid plans make good sense. If you have kids who like to spend a fair bit of time chatting or texting, they won't break your bank on a prepaid plan with unlimited calls and texts. For users who just want to talk and don't care about data, especially if they're using a simpler "feature phone" type device, these plans are also a good match. If you're happy with your existing handset and aren't locked into a contract, switching to prepaid can simply save you money on your existing contract charges.
What about unlimited data plans?
Telstra's Ultimate phone plan is theoretically unlimited downloads at full speed, but at a whopping $199 per month. Otherwise, there are multiple providers offering unlimited downloads with full-speed quotas and throttling available.