To answer your question about the Sony Ericsson PC Companion software: This software was developed to manage the contents of your Sony Ericsson mobile phones. Typically, it supports a wide range of Sony Ericsson devices, even older models. However, compatibility might depend on the specific phone model and the version of the PC Companion software you are using. Generally, as long as the phone can connect to your computer via USB, it should be recognized by the PC Companion. If you encounter issues, check if there are any updates or patches available for the software that improve compatibility with older phones.
