How to change the USB connection options on my Sony Xperia E3

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You can change the USB settings so that your phone will sync, charge, etc. when connected to a computer.
1. Touch Applications.
2. Touch Settings.
3. Touch Xperia™ Connectivity.
4. Scroll to and touch USB Connectivity.
5. Touch USB connection mode.
6. Select an option (e.g., Media transfer mode (MTP)).
7. Touch OK.
8. The USB connection option has been changed.
Both the MTP (Media Transfer Protocol) and MSC (USB Mass Storage) mode have similar functions that enable the transfer of files between two devices.

Both will allow you to transfer files, pictures, videos, etc.

MTP allows you to use other functions on the device while connected, supports MSDRM (Windows Media Digital Rights Management), there is no limitation on the file size to be transferred and is used on a PC only.

MSC does not allow other functionality while connected, there is a 4Gb file size limit, it allows you to play files through a car-kit and can be used on a PC and Mac.