A consumer group says 9 out of 10 smartphone users over-pay for data plans. Find out how you can cut costs from the Executive Director of the Citizens Utility Board.

• More on the Story: How to save on your cell phone bill
• More about the CUB
• CUB's Guide to Cell Phone Data Plans
• CUB's Cellphone Saver
• Verizon on monitoring data
• Tips to avoid higher data charges