It was explain to me as being the required hotspot data package to take advantage of the free phone add a line promotion.
Pretty sure that "SelectChoice AAL UNL TT+D 10" is what you see when you have the grandfathered Family plan 50 that includes two line and cost 10$ to add a line. It was called select Choice in one of its iterations. Select Choice = plan name, AAL = Add A Line, UNL Talk Text + Data = Unlimited TT + D, 10 = $10 cost.Source - I also have this charge and that is what I figured it out to be after talking to CS.
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