More than that.
These devices have been around since the 80's. The first clue that the official 9/11 story, for me, was bullshit was the cellphone calls from the planes. They put in anti-fraud devices in the AMPS (old analog) cellphone network that if your phone connected to two non-adjacent cell towers, it was cut off… because what criminals were doing was a type of phreaking with these boxes. They would clone the serial numbers and sell them, then it would work for the rest of the month until you got a yuuuuge cellphone bill.