Where a mid-range smart-phone would consume about 100 megabytes of data a month, more advanced models like the Apple iPhone or Motorola Droid, with fully fledged browsers and access to thousands of downloadable applications, tend to consume over 500 megabytes a month.

ECONOMIST: The faster the internet becomes, the slower it loads pages

But the follow on orders have been experiencing longer delays, and the more advanced models of the iPad Mini with mobile data support joining Wi-Fi, have had their release dates pushed back.

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