Sony Ericsson T300 pinouts
The connector/pinout information may be applied to the Sony Ericsson model T300

 Sony Ericsson  R520, R310, R320, T28, T39, T68, T68i, T610, T630 and others cell phones cable connector pinout for J200i, J210i, J300i, K300i, K700, K700i, S700, S700i, F500, F500i, K500, K500i, T616, T628, T637, P800, P802, P900, P908, P910, T200, T202, T226, T226s, T230, T238, T290, T292, T300, T302, T306, T310, T312, T316, T20, T28, T29, T36, T39m, T39mc, R520, R520m, R520mc, T65s, T60c, T62u, T68i, T68m, T68mc, T68ie, z1010, T100, T102, T105, T106, T66, T600, R600, R600s, R600sc, A2618, A2628, A3618, Z200, Z300, Z500i, Z600, Z608, Z1010, S700, V600i, V800
Sony Ericsson  R520, R310, R320, T28, T39, T68, T68i, T610, T630 and others cell phones cable connector pinout for J200i, J210i, J300i, K300i, K700, K700i, S700, S700i, F500, F500i, K500, K500i, T616, T628, T637, P800, P802, P900, P908, P910, T200, T202, T226, T226s, T230, T238, T290, T292, T300, T302, T306, T310, T312, T316, T20, T28, T29, T36, T39m, T39mc, R520, R520m, R520mc, T65s, T60c, T62u, T68i, T68m, T68mc, T68ie, z1010, T100, T102, T105, T106, T66, T600, R600, R600s, R600sc, A2618, A2628, A3618, Z200, Z300, Z500i, Z600, Z608, Z1010, S700, V600i, V800 Ericsson handsfree HPB-20 schematic pinout for use with SonyEricsson and Ericsson R-, T-, A- series. Not for T1x, R250, A1018, T206.
Ericsson handsfree HPB-20 schematic pinout for use with SonyEricsson and Ericsson R-, T-, A- series. Not for T1x, R250, A1018, T206. Sony Ericsson DSS-25-like cable schematic pinout for SE K700, K700i, S700, S700i, F500, F500i, K500, K500i, T610, T616, T630, Z600, P900, P908, T226, T226s, T230, T238, T200, T202, T310, T312, T316, T300, T302, T306, P800, P802, T39m, T39mc, R520, R520m, R520mc, T65s, T66, T62u, T68i, T68m, T68mc, T68ie, z1010, T100, T102, T105, T106, T66, T600, R600, R600s, R600sc, A3618, T610, T628, T616, T616, T630, Z200, Z600, Z608 models
Sony Ericsson DSS-25-like cable schematic pinout for SE K700, K700i, S700, S700i, F500, F500i, K500, K500i, T610, T616, T630, Z600, P900, P908, T226, T226s, T230, T238, T200, T202, T310, T312, T316, T300, T302, T306, P800, P802, T39m, T39mc, R520, R520m, R520mc, T65s, T66, T62u, T68i, T68m, T68mc, T68ie, z1010, T100, T102, T105, T106, T66, T600, R600, R600s, R600sc, A3618, T610, T628, T616, T616, T630, Z200, Z600, Z608 models Sony Ericsson P800/P900/P910i headset / handsfree connector pinout Wiring for the 2.5mm 4-pole headset socket as on the SonyEricsson P800/P900/P910i cell phones.
Sony Ericsson P800/P900/P910i headset / handsfree connector pinout Wiring for the 2.5mm 4-pole headset socket as on the SonyEricsson P800/P900/P910i cell phones.