Although currently all the rage, mobile broadband bundles featuring free laptops are not as good value as they can first appear, according to one expert.
Speaking to the Times, Broadband Choices' Michael Phillips has made the point that the contracts attached to such offers are often long-term, such as 18 or 24 months.
As well as missing out on new developments such as speed improvements and price reductions while tied to the deal, those who opt for the bundles will end up paying back the price of their "free" computer over the course of the contract, Mr Phillips suggested.
He advised: "By our calculations it makes sense to buy the cheapest alternative mobile broadband deal and buy a laptop from Play.com.
"This could save you up to £40 across the contract term."
Figures from market analyst GfK show that nearly 150,000 mobile broadband dongles were sold in the UK over September.