My current internet plan is NBN Cable Broadband XL Bundle Superfast.and paying $99.99 a month.
Is it different to NBN 100? Which one is better deal?
If it offers same/fater speed and cheaper then I should change.
Welcome to the Community!
The NBN Superfast and NBN 100 is just the same. Your current plan includes phone calls (National/International), which is why it costs $99.99/Month.
If you don't use the phone service, then you may change your plan to the NBN 100 (Superfast) for $89.99/Month. Any phone calls will be pay-as-you-go.