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Nokia Series:
Download the .nth file to your PC and then copy it to your phone's theme folder. You can access the theme through Settings - Themes.
Download the theme for Nokia
HTC Series:
Sync your mobile phone with Microsoft ActiveSync and open the Explorer icon. Open the following directory "My Windows Mobile-Based Device/Window" and copy and paste the *.TSK file into the Window folder. When the file transfer is done restart your phone. Once the phone has restarted tap the “Start/Settings/Today” and select theme you installed
Download the theme for HTC