does anyone know if the amount of data download 'limit' in a month from an isp e.g talktalk which is 40gb permonth, is calculated on the day of your contract or from the 1st to the 31st of each month.
e.g if your broadband contract started on the 15th of a month is your monthly limit then calculated each month there after from the 15th to the 15th.
or
does it revert always to the 1st to the 31st of each month.
hope that makes sense