Over half of British companies have never checked to see how easily their websites can be accessed from a mobile, according to research from 1&1 Internet.
Chief executive officer of the group Oliver Mauss noted many organisations, in particular smaller firm, could be missing a key marketing opportunity.
"Businesses must ensure that when their website is viewed on a mobile, it loads promptly, functions correctly and comprises an attractive and fitting representation of them," he said.
Only seven per cent of respondents stated their sites had been optimised for mobile viewing, while 65 per cent stated they had no plans to consider the area.
The web hosting service also found 36 per cent had discovered reduced functionality for users on smartphones when testing their services.
A recent report by mobileSQUARED revealed online marketing services for mobiles in the US were worth almost $800 million (£497 million) this year, but are expected to jump to $5 billion by 2015.
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