TUCSON -- The 23 illegal immigrants were lost in the southern Arizona desert, where the temperatures had been soaring well above 100 degrees. They were running out of water, running out of time. A cell phone proved to be their lifeline. A call to 911 launched Border Patrol search-and-rescue teams. By nightfall, the group had been saved. "Had they not had a cell phone, they would not have been found," said Ron Bellavia, commander of the Border Patrol's search, trauma and rescue operations in the agency's Tucson sector, which covers most of Arizona's border with Mexico. Last Sunday's distress call...