Samsung SGH-F490 pinouts
The connector/pinout information may be applied to the Samsung model SGH-F490
Universal (Nokia) 3.5 or 2.5 OMTP headset (LRMG) pinout for most Nokia,Motorola and other cell phones
Universal Apple-compatible CTIA Headset/Earphone 3.5mm Jack (LRGM) pinout for Samsung, HTC Hero, Blackberry and other cell phones with 3.5mm, 4 connection (4 "pin"), headset jack.