The Portosic OS 4 was released on October 18, 2004 by Theorysonic.
- Full touchscreen capability for TheoryPhone.
- New user interface and theme to make TS-UGOS TEN style.
- USB 2.0 and mass storage support.
- Added support for Portosic Touch.
- 3G networking support.
- It is the last version to support TheoryPhone IIc.
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