Cheap smartphones and tablets have put Web-ready technology into more hands than ever. But the price of Internet connectivity hasn't come down nearly as quickly. And in many rural areas, high-speed Internet through traditional phone lines simply isn't available at any price. The result is a divide between families that have broadband constantly available on their home computers and phones, and those that have to plan their days around visits to free sources of Internet access. That divide is becoming a bigger problem now that a fast Internet connection has evolved into an essential tool for completing many assignments at public schools.