Broadband firms fail to warn on speed Two in five mystery shoppers were given information about factors that can affect their broadband speed, up from from 34 per cent in 2012. Of the provders surveyed, EE, Plusnet and Karoo all provided speeds information in 100 per cent of mystery shopping calls. O2 was least likely to provide a speed range, supplying this in 58 per cent of calls. Talk Talk (47 per cent of calls) and O2 (55 per cent) were the least likely to provide an unprompted speed estimate. Ofcom said it would take action to improve compliance with the voluntary code, introduced in 2010, and perform further mystery shopping exercises. It added that it will also be undertaking a full review of the Code to ensure that it best serves consumers" needs, taking particular account of increased take-up of superfast broadband packages. Claudio Pollack, Ofcom's Consumer Group Director, said: "The results of our mystery shopping are encouraging, with the quality of information being provided to consumers at the point of sale improving overall. However, the research has identified areas where providers need to do more to improve, particularly in terms of providing speeds information spontaneously and early in the sales process. We're already working with providers to ensure they tighten up their sales processes where we've identified concerns.