Our readers wrote in on how they tried to take a vacation from their smartphones. Christian Wheatley/iStockphoto hide caption

itoggle caption Christian Wheatley/iStockphoto

A salesperson demonstrates the Apple iPhone 4 in New Delhi, India. While mobile device use is growing rapidly in emerging markets, Apple's current product line may prove prohibitively expensive for many consumers. Manish Swarup/AP hide caption

itoggle caption Manish Swarup/AP