I would need a lot more information than this youtube and the scant reporting done on CeeCee Lyles, and her husband Lorne. I don't know the source of this audio, or whether or not Lorne has proof (like an electronic log of his cell phone captured IDs with dates). It could be a stewardess helping CeeCee make the call and saying "you did great." Or it could be someone next to her saying that about something one of the other passengers had just done.
There may be interesting data here, but it needs a lot more scrutiny than this. The mere fact that the video's producers are jumping to all sorts of wild conclusions without more information is also helpful in determining how we should treat this material.
On the video's information side bar, I see a link to Info Wars, where anything can become dramatic information with the slightest amount of imagination.
I don't know anything about this material, and it's not sourced, referenced, or corroborated in the video. As for the husband, he's an unreliable witness due to the emotional nature of the event.
Yet, the video would lead us to the point that we can envision mass shootings on the ground. Don't you see a problem with this kind of material?
The maker of the video goes too far, but that does not change the fundamental facts.
What facts are those? You don't have any solid evidence here that the call wasn't made from the air. You don't have any evidence here that the caller was coerced to make the call. But you do have hysteria, and a lot of it.
I have tested the ability of cell phones to operate on airliners a number of times.
That is an incomplete proof. It offers little in the way of scientific evidence with respect to this case. It is further diluted by the fact that you are trying to support your case with your own evidence.
Links posted to this thread sourcing independent evidence that cell phones never work at high altitude would be useful, possibly, if we agree that she was at high altitude during that phone call, which would take a whole different set of proofs to validate.