At a small store on Eighth Street near Miami's Little Havana, Armando Perez paid $25 to activate his daughter's cell phone in Cuba. Store owner Laura Benitez sat behind a glass window, typing in the phone numbers for Perez and others calling Cuba. "I call my daughter every week, even if it's just for her to say, 'Papi, I love you,'" said Perez, a thin man who left the island on a boat in 2008.