Each device may be tied to a rate plan, but also each device can rack up serious service charges, depending on how and where it is used.

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We know our customers value fast and convenient service and we want our Rack stores to have the tools and capabilities like mobile check-out devices to take care of the customer on their terms.

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But he said he wanted safeguards to make sure that the health service did not use the new regime to rack up big deficits over three years.

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Nevertheless, some are warning that users may rack up unexpectedly high charges using the service.

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We use an online bill-paying service, and we buy almost everything by credit card so we can rack up mileage rewards.

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