The existence of broadband blackspots in some rural areas of the country has meant customers of some providers suffer inflated costs, according to Ofcom.
In a recent report, the industry watchdog highlighted that although take-up rates in rural areas has now overtaken those of urban zones, there is a disparity in cost which could get worse.
The examples of Tiscali, which has 12 million households within its blackspots and AOL, with ten million, were given.
Customers living in these parts of the UK can be asked to pay between £8 and £10 more for their broadband.
Head of broadband and mobiles at moneysupermarket.com, Rob Barnes, said it was the responsibility of Ofcom to ensure providers are not overcharged for access needs.
He commented: "With the Ofcom review of BT's Openreach charges due at the end of the year, costs are certain to rise.
"Ofcom should be ensuring providers accessing wholesale areas are charged a fair amount in order for the provider to then pass on the best value deal to the consumer."