A lot of mobile phones won’t actually include an antenna for the FM radio inside and instead rely upon the wires inside your
earphone cable to pick up the reception. This is also why when you try and run the FM radio application on the SGS without earphones connected it will refuse to start audio playback. However, there have been mobile phones with an internal FM antenna such as the
Nokia 5030 and other feature phones. Having said that feature phones are less sophisticated and space challenged compared to
smartphones.