FastPort
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The FastPort was a proprietary polyconnection interface used on all Sony Ericsson cellphones between 2005 and 2010. Designed in response to Nokia's proprietary Pop-Port, FastPort provided data transfer, charging, headset and speaker connections through a common interface. It was discontinued in 2010 and replaced with a micro-USB for charging and data, and a TRRS connection for audio (headphones).
Transfer of data and files
A USB FastPort-cable enables file and data transfer between a computer and a Sony Ericsson cellphone. Most models could act as a USB-storage-device, modem, phone and could load new firmware either with Sony Ericsson Update Service application, or with 3rd party software. FastPort was the interface to the PC to realize these functions.
Charging the battery/powering the phone
The port can charge the battery and power the phone while it is connected to, for example, a hands-free solution in a car. The FastPort became the only way to get external power to the phones. Chargers comes in several varieties, from 12/24 volt DC to use in cars, to 100-250 volt AC to use elsewhere. Some charger-models can only charge the phone (the cable is attached at the middle), in others all the connector pins through to the plug end, thus supporting data/signal transfer while the phone is being charged.
Sound accessories and headsets
The port also connects wired headsets or speakers, etc.