According to Cellular News daily text messaging in the United Kingdom exceeds 55 million:

The total number of chargeable person-to-person text messages sent across the four UK GSM networks in February 2003 totalled 1.53 billion. February's figure takes the daily average to 55 million compared to 44 million in February 2002 and 28.8 million in February 2001.

As February's figures continue to show, texting has become the premier communication tool for the millennium. Six times (78 million) as many text messages were sent on Valentine's Day compared to traditional cards, as romantics across the UK sent messages of love to partners via text message.

According to Mobtopia, the US lags behind with a mere 1 billion text messages in 2002 (the UK total works out to around 1.53 billion).