Broadband users considering signing up for a bundle should check that the internet part of the deal meets their requirements.
That is the view of the Times' personal finance editor, Andrew Ellison, who has pointed to the limited data allowances often apparent with broadband bundles.
According to Mr Ellison, such deals may not always be the right option for heavy users, who could find that buying broadband as a separate service works out best.
"Heavy internet users might find that bundled phone and broadband deals have a cap on monthly downloads," he said.
"If each part of the deal is what you need, it can save you money, but if not, it may be better to buy each service separately."
Sky recently attempted to encourage more broadband bundle customers by making its Sky Talk customers exempt from a £5 broadband price rise.