I plug my 4S into a transmitter to listen through my car speakers. The phone gets hot, is this normal?

I used a radio transmitter connected to my 4S to listen to music through my car speakers, but the phone gets hot.  Is this  normal?

Yes it is. It is usual for your phone to get hot (not to the point where it burns, but noticably warmer) whenever it's charging, playing music, or using an app that takes a lot of power (like navigation). Especially in a car, where the ambient temperature can get pretty hot.
As long as it doesn't hurt to hold your phone or the phone doesn't give you a temperature warning then it's normal.

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