Hilton Head, S.C., is an island full of sandy beaches, manicured golf courses and lush green trees. But one thing the island community doesn’t have is good cellular coverage. The local government has decided to do something about it, and with the help of mobile crowdsourcing technology, it has begun making its case to wireless operators for better service. As you might expect from a town that thrives off a tourism and seasonal residents – 2 million visitors a year frequent the island –...