SLF3
I've also found BA, Alitalia and SAS will offer lower prices on the phone than over the web.
Just a guess ... if they post prices on the web, their competitors can find the prices by using a programme called a 'web-crawler' or a 'screen-scraper'.
Whereas, if the prices are on the phone, their competitors will have to pay a human being to generate spurious booking calls, to get the information, before ringing off.
If you publish figures - all can see but if you only talk them - the audience is limited.
But thanks for the tip-off!!