What do you call the "ear speaker" in a mobile phone?

We have a call/messaging app that can use three different ways to get sound to the user:

• Bluetooth
• Speaker
• Ear...speaker...thing...?

What does one call the speaker for the ear in a mobile phone, in contrast to the [loud]speaker and a Bluetooth device?

(I'm a native English speaker myself, but I'm having trouble coming up with a good term.)

Whatever piece of hardware you use to hear to sound it is some form of speaker. The one you use by holding it to your ear is the internal speaker because it is built in. This website {which tells you how to fix a mobile phone} implies that at least some mobiles have a separate speaker for hands free.

The one the OP is talking about is the internal speaker, as opposed to the earphones, Bluetooth speaker or, as mentioned above, the hands-free speaker.

If you shop for parts for an iPhone on Amazon, it is called...

ear speaker

Most popular cell-phones have one ear speaker, and another for SpeakerPhone, ringer/buzzer, and music. The SpeakerPhone is often referred to as a "loud speaker" when requesting parts.

Just about any brand replacement calls them by those terms. However, at one place on Amazon, it also calls the ear thingie an...

ear speaker earphone

Moving forward...

With the removal of the 1/8" earphone jack on the 7, Apple was able to put TWO speakers for stereo playback. The latest Apple X all have 2 speakers located at the "bottom" of the phone in addition to the ear speaker at the "top".

I think that part of the confusion on which is the "correct" term depends on whether you are a consumer, a tech-savvy user, a technician, or an engineer.

That said, a "speaker" is an electro-acoustic transducer that converts electrical impulse into sound; it works the opposite of a microphone, which converts sound into impulses. Originally they were called "loudspeakers" to differentiate them from a speaker giving a speech. Now we just say speaker. Most people get confused because they think a speaker is the thing they hook up to their car or home audio system.