MARTIN Lewis has issued an urgent warning to mobile phone users who could be overpaying on their bills.
In the latest MoneySavingExpert.com newsletter, Martin is urging people to make one simple check.
According to Martin, the prices of the cheapest new sim-only deals are continuing to fall and there are some big savings to be had.
For Brits who are looking to cut down on the cost of living this simple switch could save you £100s a year on your phone bill.
If you are one of the 14million Brits out of contract, Martin recommends taking a look at some sim-only deals as the savings could be substantial.