Upon Apple’s announcement of a new iPhone – the iPhone 3G S, slated to be available June 19 – Nielsen takes a look at iPhone insights on its users and usage.

As of April 2009, Nielsen estimates that there are 6.4 million active iPhone users in the U.S., up from 2.1 million a year prior. The most impactful iPhone announcement this week may be the price reduction of $99 for the 8 GB version: cost has been one factor (in addition to AT&T exclusivity) that’s kept the …