Verizon Wireless customers sent and received more than 10 billion text messages (or SMS messages) in June 2007, a company record and the highest reported total of any wireless service provider in the nation.

Also in June, Verizon Wireless customers sent and received more than 200 million multimedia messages (MMS), which include picture and video messages.

Both monthly figures represent an increase of more than 100 percent from September 2006, when the company broke the five billion monthly text message threshold for the first time.

And in case you were wondering:

If a person were to send a single text message every 15 seconds, it would take more than 4,750 years of continuous texting to send 10 billion text messages and more than 95 years to send 200 million multimedia messages.

Official Press Release (via Textually)