Being able to use your device while you’re on a call is a great feature of having a smart phone, Fxhound. I regret hearing that you have been trouble with this since the latest update. Let’s gather some additional clues. Did this start immediately after the last update? Are all of your applications up to date? What happens if you test this in safe mode? Here’s how to restart in safe mode: https://www.verizonwireless.com/support/knowledge-base-211218/
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