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Customers of Big Mobile Providers Overpay and Are Underserved, Says Which?

A Three mobile phone store and an 02 store, in Reading, U.K.

A Three mobile phone store and an 02 store, in Reading, U.K.

Photographer: Jason Alden/Bloomberg

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Phone users could be paying more than they need to and receiving worse service by staying with the UK's biggest mobile networks, consumer champion Which? has said.