Money saving guru Martin Lewis has shared a simple tip that could save people hundreds of pounds a year.
On ITV's Martin Lewis Money Show Live, the finance expert looked at the most common household bills and where costs can be cut as energy and petrol prices continue to soar.
Inflation is currently at a 30-year high, rising by 5.4% in the year to December.
The cost-of-living crisis will intensify dramatically in April when energy bill caps go up by 50%, instantly increasing household spending.
But Martin says there is one regular expenditure which consumers are consistently spending too much on: mobile phone tariffs.
He surveyed Twitter and found 30% of respondents were paying more than £30 a month.
But he explained this should not be the case as 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?"
He continued: "If part of your bill 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 to switch their SIM card in order to bring down the price of their mobile phone bill.
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 the lesser known network provides piggyback 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.
