On the Australian plans we checked in August 2026, entry-level answering plans start around $25 to $49 a month plus GST. That buys the account, not the calls. Answered calls are then charged at roughly $2.60 to $4.00 each, and going over your plan costs about $2.45 to $3.99 per call on top.
So a tradie taking 50 calls a month on a $29 plan is not paying $29. At $2.60 a call that is $130 a month; at $4.00 it is $200 — for messages, not booked work. The monthly fee is the smallest number on the invoice.
Flat-rate services exist and price differently: you pay one monthly figure for an allowance of call time rather than per call. Giday is one of those, from $49 a month including GST. The comparison that matters is not plan against plan, it is what 50 calls actually cost you under each model.