I have an iPhone X Max. When I attempt to answer most calls, there is no sound on either end for the first 12 or more seconds. Complete dead air. I can't hear them, and they can't hear me. Frustration forces me to hang up. What's going on with my calls?
Hm that would be weird. Can you try updating the network settings for me? You will find this under general settings, scroll down to reset, and reset the network settings. Let me know if this helps.
We might have to further look into this. Send me a PM and we can look into the account.