Please provide more specifics about all equipment/makes/models/services/phone providers involved so we can assist more thoroughly.
For the record though, screaming into any phone obviously won't help ;).
I often speak with people who are in noisy places and when I do, either I can't hear them or more often they can't hear me. Not due to the noise around them but because of the phone. It cuts out my voice when their side is noisy and vice versa. My previous phone, a cheap Panasonic, was great. I've tried a new Panasonic and now an ATT and both are awful. I'm screaming into the phone and even then they say they can't hear me.