Neilsen Mobile recently reported on US 2008 Q2 mobile phone usage. They find that the number of calls made per month averages 204 across all users but does not vary all that much with age between 13-54:
On the other hand, as stereotypes would suggest, teens drive by far the highest number of text messages per month. Although the average across all users is 357, there is very high variability:
When looking at the ratio of texts to calls, the difference is even more marked. Teens (13-17) text 7.5x more often than they call whereas seniors (65+) call 7x more often than they text:
As an aside, the overall ratio of texts to calls is about 1.75:1 and has been greater than 1:1 since q4 of 2007.
Which companies do readers see as making the most interesting use of SMS
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