Those are great concerns as we want you to be able to hear your phone to ensure you can answer your calls. To get to the ring selection please navigate into settings>sounds and haptics>ringetone. Here you will be able to select a different ring. Also ensure that your do not disturb feature isn't enabled, settings>do not disturb. One last thing you may want to check is the lock switch on the side of the phone above the volume buttons. If that is locked that will silence the phone.
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