Lost Symbol information on Twitter: @lostsymbol
In The Lost Symbol, a phone number for Peter Solomon is mentioned (page 14 of my copy) which is not the usual fake '555' number, but in fact a real one (not to be confused with the SymbolQuest competition phone number that can be deciphered from the cover code). Plenty of people have tried calling it, generally just getting a voice mailbox for 'Peter Solomon' at which they could leave a message. However, soon after publication some strange things started happening, with people getting callbacks, messages to drive to certain locations, and different numbers to call (see the comments beneath this story).
One of those that received a callback was Cryptex member 'Thothamon', who was told to visit a location 5 hours drive away in order to receive a signed copy of The Lost Symbol. Rather than blindly following orders, Thothamon dug further into the issue, emailing Doubleday about the callback, and found that it is likely that the phone message system was hacked, and is now compromised. This is the response he got back from Doubleday:
Please do not go to this location. This is an absolute hoax and we are looking into this as is the Random House legal team. Somehow someone with very bad intentions hacked into the phone number message system of the number published in the book.
Thank you so much for bringing this to our attention. I will be in touch as I learn more.
So - *do not* call the Peter Solomon number in the book! Thanks to Thothamon for the heads-up.