When we are allowed to use mobiles and all start using them, the pilot can here a bit of interference or a kinda disturbance in his conversation. If phones and other gadgets are stopped from using, the pilot experiences a clear conversation somewhat like the VOLTE feature in a phone on and off when phones are not being used and being used respectively for clarity and no disturbance.
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Probably because everyone on the plane switches their phones back on so the collection of all their signals join together enough to have an effect on cockpit equipment. Thanks for your comment!