"Foreign language classes have proven a popular target for cash-strapped administrators looking to cut costs. We understand the money has to come from somewhere, and the practicality of a class like Latin could be debated. But as the United States continues on its path toward being home to the most Spanish speakers in the world, we can ill afford to let up on its instruction. Luckily, interested smartphone owners hold the key to a wealth of Spanish teaching in their pockets. Below, grouped by phone type, are our picks for the 25 best mobile apps (although some are available across platforms)."