In a recent study by Consumer Affairs, about one in five used more minutes than were anticipated. There is a 1-in-25 chance during a year of getting a cellphone bill that is $100 more than expected. Recently, the Federal Communication Commission proposed requiring wireless carriers to alert consumers when they’re about to reach their plans’ limits. That includes call minutes, text messages or data use specifically so they would not be shocked. Their estimates are about 30 million people experiencing a sudden increase in their bill at some point.