Consumer group `Which?' has said that millions of people are paying more than they need for the service they need.
The consumer watchdog found in a survey that 70 per cent of people check their mobile bill at least once a month, but as many as 10 million mobile phone users pay for extra calls, texts plus data usage on top of their monthly charge.
According to the survey, around six million users either don't know or have only an obscure idea, about the limit of their monthly plans. Five million users are found unsure about their text and data limits.
The consumer group said that mobile phone users could save money by moving to a tariff that better suited their needs; however, 18 million people or 39 per cent of mobile phone users never switched mobile phone provider. Commenting on the findings, consumer group's chief Tom McLennan said, "You could be spending hundreds of pounds more than you need to on your mobile every year if you're not on the right tariff."
McLennan added that those who regularly fork out more than their line rental should check their bill to determine where there are incurring the extra charges. This would allow them to move to a better tariff and save money.