Samsung SCH-R350 Freeform pinouts
The connector/pinout information may be applied to the Samsung model SCH-R350 Freeform

 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.
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.  Micro-USB mobile phone/smartphone cable connector pinout standard micro-usb cable
Micro-USB mobile phone/smartphone cable connector pinout standard micro-usb cable MRLG 4-pole 2.5mm headset connector pinout MRLG pinout
MRLG 4-pole 2.5mm headset connector pinout MRLG pinout