Mobile Phones and Smartphones connectors  > Motorola pinouts
for data/flash cable only, may work on the C139 and C168 "Go Phones". Plugs in the headset connector.
Pin Signal Description
L Tx   may be rx
R Rx   may be tx


Special cable needed. Here is a cell phone cable scheme.

3 pin stereo plug connector layout
3 pin stereo plug connector
at the cellular phone (2.5 mm jack used)
According to 12 reports in our database (10 positive and 1 negative) this pinout should be correct.

Is this pinout
Source(s) of this and additional information: GSM pinout by Bruce, infinity-box
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