Someone sent me this article from the Guardian; it’s a study from Cable on the price of mobile data around the world…
The range is amazing – the UK comes in at 136 (out of 230) with an average of £5.15/GB, miles behind India at the top with 20p/GB(!). The most expensive is Zimbabwe with a £57.77/GB average. (Using current exchange rates.)
As the study mentions, the price comes down to a lot of things – reliance on mobile networks, cost of infrastructure, economy wealth, average consumption… You can download the spreadsheet here.