Apple has sold 500 million iPhones as of Tuesday, reports Forbes. This is a milestone that has passed with no official acknowledgement from Apple as of this writing.
It certainly seems like the iPhone has been around forever, and has been a popular choice the entire time. However the truth is that it took awhile for the iPhone to pick up steam. It took until February 2011 to sell the 100 millionth iPhone (nearly four years). According to my math, Apple sold 6.5 iPhone a *second* last quarter. That's every single second, not taking business hours or any other factors into account.
When you consider that a majority of the phones sold in the last two years are still in circulation, that's millions and millions of iPhones currently in use before you get to the hand-me-downs and the people who just really love their 3G s or 4 and haven't let it go yet, upgrade or no.
Hopefully Apple will make mention of this in the Q2 2014 results call, which should happen sometime in April.