How can I use my iPhone without having to use the speaker?

Hold the phone to your ear, and adjust the volume while on the call. On the 14 and later phones there is no visible ear hole, but it will work anyway.

Defanddum wrote:

How can I use my I phone without having to use speaker

[Re-Titled by Moderator]

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