Martin Lewis has issued a warning to anyone who pays more than £10 a month for their mobile phone.
The money-saving guru confirmed that nobody should be paying this much as he issued urgent advice on an episode of his TV show, ITV's Martin Lewis Money Show Live.
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The saving experts urged viewers to reduce their outgoings by looking at what they pay for their phones.
A recent edition of the show was dedicated to helping people reduce the cost of some common bills in the wake of soaring energy prices.
Martin devoted the first segment of the show to how people can reduce their mobile phone bill, Liverpool Echo reports.
The finance expert explained the price of the average 4GB phone deal has halved in the past five years and urged people to check their contract.
He said: "If you haven't sorted out or changed your mobile phone deal, you are likely paying way too much.
"My big question would be, 'are you paying over £10 a month?" If so, why?"
Martin conducted a poll with his Twitter followers and found over 30 per cent of the people surveyed pay more than £30 a month for their mobile phone.
He continued: "If part of that is repaying a handset, fair enough. If it's because you roam a lot, then fair enough.
"Maybe if you've got poor credit and you have to be on pre-pay, but that shouldn't be too much more expensive."
Martin recommended people switch their SIM cards in order to bring down the price of their mobile phone bills.
The Money Saving Expert showed examples of cheap SIM deals starting from as low as £6 a month for a 10GB deal with Lebara.
Martin explained that lesser-known providers piggyback their signal from the major four networks so people should not be worried about a drop in service.
He said: "If you want to cut your cost you can keep the same signal, but by changing to a different virtual network."
The consumer champion also said anyone who wants to switch SIM card can keep their current mobile number by texting PAC for free to 65075.
