According to a document released by the London 2012 organisers, "personal/private wireless access points and 3G hubs" are banned from any venues at the Games.
Smart devices such as Google Android and iOS phones and tablets will be allowed inside venues, but they must not be used as wireless access points to connect other devices to the web.
It has already been announced that large photographic and broadcast equipment over 30cm in length is banned, including tripods and monopods, while any camera kit must not be used for commercial purposes unless the person holds media accreditation.
Tomas Mendoza, the managing director of Tep Wireless, said that the ban on wireless access points and 3G hubs will be disappointing to some visitors to the Games.
"We're just two days away from the start of the first ever Olympic Games in the modern, digital era. But unfortunately the organisers clearly don't appreciate the advantages technology is offering - and what the public expect as a result," he said.
"Fans are allowed to bring their iPhones, iPads and Android phones and tablets into Olympic venues - but strangely, they're not allowed to use wireless access points to connect multiple devices.
"These are the people who've had to go to the considerable trouble - and expense - of buying tickets, booking flights and finding affordable accommodation in one of the world's most expensive cities.
"Their next priority is to have reliable and affordable mobile internet connectivity for all their devices so they can share their once-in-a-lifetime experience with family and friends."
Meanwhile, The Cloud is preparing for the expected influx of visitors to the UK around London 2012 by adding seven new languages to its WiFi service.
The Sky-owned company has also said that 100 million minutes of WiFi are used over its UK network every week, as usage of internet-enabled mobile devices continues to increase.
According to the Department for Transport, around 500,000 tourists are expected to visit London between July 17 and August 18.
In order to make it easier for visitors to get onto the internet, The Cloud is today adding new landing pages and FAQs in seven additional languages, including Chinese, Japanese, Russian, French, Spanish, Portuguese and Italian.
The service, which is already available in German, Finnish, Swedish and Danish, as well as English, instantly recognises the language settings in the user's browser and displays the correct language.
The Cloud is also celebrating London 2012 by expanding its recently-launched content portal so that it is available across the entire outdoor network in the City of London and in Westfield Stratford, along with the 52 rail stations previously announced.
The portal offers free access to Sky News, Sky Sports News, a live Olympic news feed and travel updates from Transport for London.
Over the past year, The Cloud has racked up 5m registered users across the UK, while its monthly usage has increased by 230% over the last six months alone.
The company claims that UK users are now accessing more than 100 minutes of WiFi every week via a network of 11,000 live hotspots, including locations at Network Rail stations, London Overground, Greene King pubs, Greggs, Westfield Stratford, the London Eye and Alton Towers.
"The demand from customers is leading a whole range of high street venues and busy public places to install WiFi for the first time," said The Cloud managing director Vince Russell.
"Businesses are realising that, by offering fast reliable WiFi access from The Cloud to their visitors, they can not only deliver a better customer experience but also provide special offers or extra services to attract people.
"This summer is likely to be the busiest tourist season Britain, specifically London, will ever have. Lots of these visitors will want to use their smartphones for updating Facebook and Twitter, sharing photos or checking into locations, so WiFi is going be vital to share the burden of all this data with the 3G network.
"We are ensuring our WiFi is ready for this growth, is located in the places where people most value it and is as easy to use as possible for everyone."