iPhone xr
New iPhone XR and whilst callers can hear me, I can’t hear them. It’s a brand new phone - anyone able to help?
iPhone XR
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Start here:--> If you can't hear a person on a call or voicemail or if the sound isn't clear on your iPhone - Apple Support
If the issue still persists, I would contact your carrier explaining your problem and asking for help.
If you get no help, since your device is brand new & covered by warranty, have it inspected at an Apple Store or Authorized Service Provider:--> Apple – Location Selector
Regards
Giulio