I can only hear calls through my iPhone speaker

Hello there,

i am facing an issue with my phone, whenever they call me I can only hear them if I put them on the speaker. I can’t undestand that my phone doesn’t even have a minor damage. Hope you’re guys able to help me cause I cannot afford to buy another iPhone. My device is IPhone 11 Pro Max 256GB Unlocked . And I purchased from the Apple store at Walnut Street in Philadelphia.

I can’t wait to hear back from you guys

[Re-Titled by Moderator]