Grabbed this from a windows phone forum
Assuming the AVERAGE download speed of 12Mbit, we see the following:
500Mb allowance represents 5mins 33s of data per month (so 11 seconds per day)
1Gb allowance represents 11mins 6s of data per month (so 22 seconds per day)
8Gb allowance represents 88mins 53s of data per month (so 2mins 57s seconds per day)
...Even with the highest bandwidth package, you have less than three mins per day of data (potentially less if your speed exceeds the average).
Let's have a quick look at what this data is costing you:
500Mb: £36 for 5.55mins is: £6.48 per minute
1Gb: £41 for 11.11mins is: £3.69 per minute
8Gb: £56 for 88.88mins is: £0.63 per minute

