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Galaxy A21 one way conversation on WIFI connection.

When there is no Cell signal and running on WIFI I get a one way conversation. Cell cannot be heard. This happens when orginating from the cell or reciving to the cell phone. Went to the VZ store and got another one and it does the same thing. Not a problem with WIFI as it does it on others. Can also be duplicated if you put the A21 in airplane mode and turn WIFI back and and make call.