Greyskull? No no no. By the power of social manipulation.
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There's apparently a way to figure out why the call ended (hung up or cut off). If you go into airplane mode, it will seem like it was cut off.
And Samsung, with all its wisdom disabled that "feature". You can't turn on airplane mode while on a call
I think it's the difference between the call ending suddenly (hang up) and the call not responding for several seconds before dropping (lost connection).