Verizon's 2.3 million activations compares to AT&T's 3.6 million announced yesterday, although AT&T's numbers include reactivations of previously-sold iPhones on new accounts. Verizon is obviously seeing little if any of that activity given that an iPhone compatible with its network has only been available for five months. AT&T also offers an 8 GB iPhone 3GS model priced at $49, an offering that Verizon is unable to match due to Apple not having built a CDMA version of the iPhone 3GS.
In the market for an iPhone? Here's a breakdown of all the currently shipping iPhones from Apple.