ISP iPrimus has announced it will charge excess data usage fees on a series of revamped 3G wireless broadband plans.
The ISP's Speedster internet products run on the Optus 3G network.
iPrimus will cut the monthly access fee on its 1GB plan in half and introduce a new 2GB quota option priced at $25 a month.
Its 6GB Speedster product remained roughly the same price - $39 a month.
The major change for all three plans was that excess data use would now be charged at a rate of 3 cents a megabyte.
The previous iteration of the plans had said there was "no excess data charge - speed will be limited to dialup speed for the balance of a billing cycle in which the data allowance is exceeded."
Under the new plans, it was possible to run up an excess usage charge of up to $60 a month (equivalent to 2GB), at which time iPrimus said it would throttle the connection speed to 128 Kbps.