Probably not much of a surprise to anyone on this forum, but:

http://www.dailymail.co.uk/news/arti...-coverage.html

I've long been aware of the fact that all the networks have both a simplified and highly optimistic end user coverage checker on their website, and a much more accurate one which only internal staff have access to.

Whats amusing though is that they use the more accurate internal version of the coverage maps in planning submissions made to local councils, and apparently thought nobody would ever notice the fact that these contradict the claims of good coverage made on their public website coverage checkers in the same locations. Hilarious!

Although I think all the networks are guilty to some degree the article singled out O2 and Vodafone for particularly flagrant and misleading differences between the public coverage maps and the private, internal coverage maps used for planning consent submissions.