Following on today's fresh claims of Sprint launching the iPhone 5 by "mid-October", reportedly with unlimited data plans, Sprintfeed now shares a purported internal Sprint memo for employees noting that vacations have been blacked out for the period beginning September 30th and extending through October 15th.
Due to the possibility of a major phone launch in October we are blacking out September 30th through October 15th.
While the memo does not specifically mention the iPhone and describes the launch as only a "possibility", it does line up nicely with the claimed iPhone 5 launch.
Apple has traditionally launched new iPhone models on Thursdays or Fridays, making October 13th or 14th the closest likely dates to the rumored mid-October timeframe. That timeframe would be pushing the end of Sprint's blackout window, however, as customer demand would be expected to remain high for several days after launch. Other rumors have also suggested that the debut could come the prior week on October 6th or 7th.