The antenna design guide I just skimmed tells me BT signals (2.4-2.4835 GHz) are strongly absorbed by human bodies. If your phone is in a pocket you'll get severely reduced coverage for up to half the area around you, + some variation from omnidirectional antenna never quite being fully spherical.
It's also a noisy band, shared with too many other services.
BT is inherently unpredictable in real life. Any distance calculation little more than a bad guess. No amount of political wish making beats physics.
Biting the hand that feeds IT
