Sorry but you need to be wary of Wikipedia when the issue is 9/11.
At the trial of Zacharias Mouassoui in 2006 the FBI only defended two of the 9/11 phone calls. I think we may fairly presume that the rest never happened.
That said, I have stayed away from the 9/11 cell phone calls in my writing -- because the issue is so contentious. There is much better agreement on some other 9/11 issues --
My forthcoming Chomsky piece will focus on the best evidence -- not the contentious stuff.