Yes the pluses are showing up but not in space grey.
Even so if you're on ATT and are looking to add a line with Next, they cannot do this in the apple store. The only way to do it is walk into an ATT corporate store. I wish I had found out the easy way as there is no way to get back the four hours I wasted!
I still like to check inventory levels abroad, could even extract an algorithm on patterns to attempt to predict a shift forward in delivery times!