Themes are applications for mobile phones which change the whole appearance of your phone including not only display background but also icons, buttons, battery and network indicators and also even ringtones.

Theme file is a kind of package which includes pictures for backgrounds, buttons and icons. It also may contain some ringtones and define colors of different labels and signs on our phone display. Themes for Sony Ericsson usually have .thm or .utz extension. Files with .utz extension are compatible with Sony Ericsson smartphones such as Sony Ericsson P900, P990, M600 and so on while .thm files are compatible with all other Sony Ericsson phones such as K750, K700, W900, etc.

All themes for Sony Ericsson vary by versions (from 3.0 to 4.5) and by screen resolutions. Most common resolutions are 128×160, 240×320 and 176×220. If you download a theme of incorrect version and/or resolution it won’t install on your phone, that’s why it is recommended to download themes only from quality sites which accurately separate themes by phone model, for example  You will only have to select your phone model and desired category of themes and download them absolutely free, without any registration. To create a theme for any Sony Ericsson phone you will need a program called Theme Creator Pro 3G, version 3.1.260 or SE Themes Creator, version from 1.80 to 3.17. SE Themes Creator is very handy and simple. You only have to select your phone model, load your images and ringtones, choose desired colors for different interface elements and save the theme file. Theme Creator can be downloaded for free at Sony Ericsson official website.