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Martin Lewis has issued a warning to millions of people with an O2 monthly mobile contract.

The Money Saving Expert has issued an alert that up to 15.6 million people's monthly phone bills could rise more than what the network provider has said, due to mid-season price increases.

Back in January, Ofcom made the ruling that phone providers must show how much bills will hike each year in pounds and pence, before clients sign up.

But, in a move that appears to run counter to the spirit of these rules, O2 has announced that from next year, those who are in the middle of contracts will face bigger price rises than they had been told about, and that were originally written in their contracts.

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O2 has declared

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