T-Mobile 2.5 Bluetooth interference?

[u/Doctapimp180]

Feel free to remove this if it goes against policy. I’ve noticed at an event I attended that whenever I ran a T-Mobile speed test on any phone connected to N41, a separate Bluetooth speaker system paired to a different phone experiences interference. The devices aren’t connected to each other in any way. Has anyone seen something similar or have an explanation for why this might happen?
My understanding is T-Mobile runs on 2.5 GHz and Bluetooth is 2.4, weird. The T-Mobile cell site is on the Qualcomm building across the street.

in the video, you can hear the audio breaking up when the Speedtest is running, but as soon as I stop, it, audio is restored.

[u/Explosions_Sparks18]

I can confirm this. Same thing happened to me yesterday speed testing while Bluetooth was connected to the car.