Post-paid wireless customers in the United States now send more text messages than they make voice calls, Nielsen Mobile said found in its latest research.

The trend began in Q4 2007, when the average number of monthly texts reached 218 compared to 213 average monthly calls.  However, Nielsen waited until Q2  of this year to announce the results, because the initial results could have been a statistical anomaly and Q1 2008 results could’ve been a coincidence, officials explained.

As of the second quarter of this year, average texts reached 357, compared to 204 calls.  The survey included 50,000 customers across all the major carriers.