I swear by my Noctuas, they are fantastic fans. I've had a full set of them in my case for about 8 years now, even under heavy gaming load the fans will get more 'whooshy' but they are hardly noticeable and keep the system cool.
Not sure why they would open these numbers up for access anyway, a lot of PABXes are programmed to recognize the 555 prefix as bogus and just drop the call without even attempting to dial it over national lines