A decade + ago, I've been told that cell phones disrupt the medical devices in medical facilities, especially in the ER; thus, cell phones have been prohibited from the ER or other designated areas where a cell phone's signal would interrupt with the medical equipment's' signals. (Similar to how we used to shut down -- or airplane mode -- our cellular devices while on an airplane). Do cell phones cause a significant degree of disruption with the medical equipment's' ability to function properly? Are they still prohibited from the ER?
I don't know if policy has changed, research has changed, human behavior has changed, or technologies changed, or a combo, or all of the above, but I have seen a dime a dozen of people brazenly using their cell phones in the ER in a close proximity to medical equipment. Are they no longer prohibited? Why or why not?