Citing multiple AT&T sources, the Boy Genius Report claims that AT&T has put a block on employee vacations in June. According to the report, the “only” times AT&T has done a straight block such as this is for iPhone releases, suggesting the next-generation iPhone will launch that month. Apple has jumped from 71st to 56th in the latest annual Fortune 500 rankings. Ahead of Apple on the list are competitors HP, which ranked 10th,…