I currently have the Unlimited Elite® plan (lowercase "p"). On the "Enjoy 5g access" page in Wireless Support, I selected my address and then initiated the "Device Support" tool for my phone number. (I have an iPhone 12 Pro (A2341).) Once the tool completed a review of my device, my results were the following:
I did not understand why it indicated my current plan, "doesn't include 5G speeds." Thus, I clicked the link to, "Choose an AT&T unlimited plan that includes 5G." I selected the Unlimited Elite® Plan and did a comparison to my current Unlimited Elite® plan. The only difference indicated on the chart comparing these plans with the same name (with the only difference in the names of the plans is that the "new" one of the same name capitalizes the word "Plan"), was that my current plan has Shared data and the new one does not. Every other feature/option of the two plans was identical.
Thus, my question is if the Device Support tool is providing accurate information when it states my current Unlimited Elite® plan, "doesn't include 5g speeds?" To date, I have yet to have any issues with 5G connectivity on my iPhone 12 Pro. Does the previous Unlimited Elite plan, with shared data, not support the same 5G speeds as the current Unlimited Elite Plan (ie. the C-band/5G+)?