Use code before answering a call
To stop unauthorized answering my phone when it's not in my hand, can I lock the screen so that it will have to be unlocked with a code to answer a call.
iPhone 6s, iOS 12
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Get with your carrier and make sure you have a call blocking feature turned on for your account. Another trick I have found is that if I do answer I do not say anything at all. I do not greet the caller. If it is spam it will hang up in a few seconds, if it is not someone will start saying hello.