The simple reason for this is that cell phones are a distraction, especially when they go off in class. From the early 1990's till now we have seen an advance in cell phone technology. For starters, kids with cell phones are often irresponsible about their usage, which can cost parents money. There are a handful of plans to choose from but all offer calling that costs the same whenever and where ever a user calls and eliminate roaming, long distance, and time of day restrictions