Motorola C350 pinouts
The connector/pinout information may be applied to the Motorola model C350
Universal Cell Phone 3-pole (mono) headset connector pinout cordless/cell phones headset/handsfree cable connector
Motorola A840 , C650 , E1 , E398 , i335 , i425 , ic902 , MOTO Q 9c , MOTO Q 9m , V360 , V361 , V365 headset pinout should work with V360, E815 and some others
Motorola mini-USB pinout For A1200, C260, C266, C330, C331g, C332, C333g, C336, C350, C359, C375, C380, C381, C450, C550, C650, E375, E380, L6, L7, MotoRazr MAXX, RAZR V3, V3x, PEBL U6, V150, V180, V188, V195, V220, V226, V235, V323, V325, V360 and others. Standard mini-usb interface used. Almost any standard mini-usb cable will work with this phones.
MRLG 4-pole 2.5mm headset connector pinout MRLG pinout