I created this chart to give consumers the ability to calculate their total annual cost, based on their carrier and current or future plan. Below are assumptions for all current existing plans, or some that can be started with either major carrier. It is assumed only one line, with a user upgrading annually. Some interesting notes: 1.) If you use 1Gb or less, an AT&T shared data plan will save you almost $200 per year, versus a tiered or unlimited data plan. 2.) Unlimited data plans are obviously the best bang for buck for high data consumption, but the real savings begin after the 4Gb or more data mark. 3.) If you are using more than 6Gb of data on AT&T, a shared data plan will provide increasing savings the more data you consume, versus a tiered plan. 4.) Even with paying $650 for your Verizon phone, you actually save more per year by maintaining your unlimited plan if you consume 5Gb or more of data. 5.) Verizon's shared data plans are as cheap as AT&T, if you consume 2Gb or more of data, on a single line. Overall advice for unlimited users: Verizon: 5Gb or higher users, KEEP your unlimited plan. AT&T: Unlimited plans provide the best value, but you will be throttled at the point in which the data plan begins provides maximum savings. I'm curious to hear your discoveries or comments.