FCC: cell phones must work with hearing aids.
D040421:Cell Phone / Q000331:legislation & jurisprudence*; D003258:Consumer Behavior; D003257:Consumer Product Safety; D004574:Electromagnetic Fields / Q000009:adverse effects; D004867:Equipment Design / Q000295:instrumentation / Q000592:standards; D004869:Equipment Safety / Q000295:instrumentation / Q000592:standards; D006077:Government Agencies; D006310:Hearing Aids; D006801:Humans; D014481:United States