Does the ear-phone of Cell Phone have a built-in Amplifier of sound?

Otherwise, could you please explain how the Sound, that is heard not so loud and clear from a tiny Cell phone’s built-in speaker when its earphone is not used, gets so amplified and heard so clear when the earphone is plugged into ears?
This I am taliking about FM songs heard from Cell Phone.

Ear phones acts as an arial for the reception of signals for a mobile phone. No, Ear phones dont have a built in amp. Yes you are rite, It is loud and clear since it is plugged into your ears which is very near to your ear drum and has distortion less from environmental sounds. So you can hear the sound loud and clear when ear phone is plugged. These are the two reasons.

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