Schools are being sold detection equipment to catch mobile phones being used secretly in exam rooms - one of the most common forms of cheating.
But pupils are also being targeted by websites openly selling "exam cheat equipment", including concealed ear-pieces to receive information.
The official statistics on cheating in last year's A-levels and GCSEs in England will be published on Wednesday.
Last year, mobile phone use accounted for one in three cases of cheating.
As mobiles have become more sophisticated - for example, providing internet access - they have become one of the biggest problems for exam invigilators.
Every exam centre must now display a warning poster telling students about strict rules on not bringing mobiles or other electronic equipment into exam halls.
Schools are also receiving adverts from technology firms selling detection equipment, promising to identify texting, e-mails or pupils using mobiles to search the internet.
Among these is Mobysafe, a Gloucestershire company, which is marketing a handheld mobile phone detector to schools.
The firm's owner, David Spurr, says invigilators are faced with communications devices and mobiles which are getting smaller and more powerful.
Tackling cheats who try to use mobile phones is a difficult challenge for examiners.
The jamming of signals is not allowed, because that might interfere with other equipment.
News Source :- http://news.bbc.co.uk
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