The brilliant Barking up the Wrong Tree blog it looks like mobiles are worth about 10% of income.
Keeping life satisfaction constant, we subsequently derive substantial GDP per capita estimates equivalent to a 10 percentage point increase in broadband and mobile phone penetration.
Median wage wage in US is about $32,000. So mobiles probably worth about 3 thousand dollars a year to the average American.
The value of the internet seems to vary from $1700 to $3800 according to this slate article
a model based on the value of people's time, ultimately estimating that Internet access is worth 2 percent of full income. Thus, they estimated the value of the welfare gain provided by the Internet ranged as high as $3,800 per person.
This means that in the 15 years that the internet and mobiles have become ubiquitous we are something like $5000 richer per year because of them.