What is instant on with AT&T?

https://lacdmhowr.powerappsportals.us/forums/general-discussion/28a7a34c-77a3-ef11-b542-001dd8097a1ahttps://lacdmhowr.powerappsportals.us/forums/general-discussion/28a7a34c-77a3-ef11-b542-001dd8097a1a