Hi Shanyce, with the Prepaid $2/day plan, there are no data alerts for your usage. You get 500mb of data within Australia for $2 a day. If you use more than 500MB, we’ll automatically deduct another $2 and bump you up to a max of 1GB of data for the day. Total daily data usage is capped at 1GB, so you won’t be able to use more data that day if you reach the 1GB limit. Please find more info here.