giffgaff is one of the UK's most successful MVNOs (mobile virtual network operator), attracting customers with its affordable 'goodybag' price plans, 30-day rolling contracts and unlimited data ...

minutes and data (it calls these 'goodybags'). Spending more gives you more minutes, texts and data. Costs outside your monthly allowance are reasonable – 25p a minute for calls to UK mobiles and ...

The problem occurred because customers who bought a Giffgaff "goodybag" bundle - comprising voice and text minutes as well as data allowances - using their prepaid credit, were overcharged.

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