Themes are typically installed via the file manager or Nokia Suite. Activation: Found under Menu > Settings > Themes > General .

Old themes were signed with certificates that expired on April 3, 2013 (Nokia’s root certificate cutoff). Fix: Set your phone’s date back to January 1, 2012 .

Themes for the Nokia C7 are primarily packaged as or .sisx files. Unlike modern Android launchers, Symbian themes are deep-level skins that modify:

The most critical aspect of finding a theme that "works" is understanding the operating system version. The Nokia C7 launched with Symbian^3 but was later upgradable to Symbian Anna and eventually Nokia Belle.