Exactly. I'm currently finishing the write-up for a study that shows a correlation between low conscientiousness + low agreeableness and high texting use at work. One of the key variables we controlled for is age. If you are less responsible, independent of age, you're more likely to act irresponsibly (should be obvious, right?). Irresponsible kids are more likely to do it through texting while irresponsible adults do it in other ways. Texting just happens to make the news because it's "novel".
Disclaimer: correlation does not equal causation. BUT logically, personality dimensions are relatively static -- it is NOT reasonable to say texting somehow makes a person less conscientious or agreeable.
The solution of this problem is trivial and is left as an exercise for the reader.