When someone calls me I can not hear them unless I clk on speaker ohone. What happened. IPhoneX

Perhaps this article will help:

If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

or see the reply to:

Ear Speaker not working for phone calls - Apple Community

CanYouSing Said:

"When I have an incoming call I can not hear them unless I clk on speaker phone. What happened. iPhone X"

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Call them Back:

I'm starting to come across this. Calling them back, seems to always work, thus far.