I remember the days when unlimited data for your phone was cheap and actually unlimited. But instead of it getting cheaper, mobile data has got more expensive. And on top of that, we're being throttled to limited amounts of data instead of having unlimited access.
The reason for this is because mobile phone operators can't keep up with the pace. More and more smartphones are being bought and we are using our phones to access the internet more than ever. Because the adoption has come very quickly, mobile phone operators are unable to afford the costs and are having to limit the amount of data we use.