ATT came up with new Shared Data Plan and was available from August 21, 2016. You can continue to use current plan. But once you change to new plan, there is no going back. The new plan claims simple pricing and no overage costs. Then, what is the catch. Here is the extract from ATT article: "Instead of overage charges, after customers use all of their high-speed data amounts, all data usage will be reduced to a maximum of 128 kbps for the rest of their bill cycle". This is good for those who are not diligent in monitoring their data usage and want a hassle free plan or are using a plan other than 15 GB. For those who are diligent in monitoring the data usage and are in 15GB plan, the new plan is not good.
ATT Mobile Share Advantage Plan is a disadvantage for those who are/were on 15GB plan. You can find the charts comparing the cost per line for different data plans in Old and New Plans. The Blue line represents the Old Plan (Mobile Shared Value Plan). The Orange line indicates the New Plan (Mobile Share Advantage Plan). It is very clear from the graphs, the new plan is indeed good for those who were on any shared data plan other than 15GB. Every plan other than 15GB has a new plan with same or more data for lower per line cost. For those who are in 15GB will have to either downgrade to 6GB or 10GB in order to maintain their monthly cost or pay more to retain the data limit.
You may click on the images to view in detail.
Cost/Line comparison (excluding taxes/fees) with 4 lines
Cost/Line comparison (excluding taxes/fees) with 5 lines
Cost/Line comparison (excluding taxes/fees) with 6 lines
Cost/Line comparison (excluding taxes/fees) with 7 lines
The content in this article is solely my perspective. You should not make any decisions solely based on this article. I would appreciate any comments you would have regarding the new ATT Mobile Share Advantage Plan.