Most themes designed for will work on the C7. However, if you have updated your phone to Nokia Belle (the final major update), the landscape changes slightly.

If you have downloaded a .sis or .sisx file only to be met with a "Certificate error" or "Unable to install," don't throw your Astound against the wall just yet. Here is the definitive guide to making themes work on Symbian^3.

This is the most common frustration. Symbian had a strict security system regarding software certificates. If a theme is unsigned and past its expiration date, the C7 will refuse to install it.

: Themes interact with the C7's three customizable homescreens. While themes provide the background and "skin," users can still manually add and arrange and other widgets on top of them. Audio Profiles

: At the time of its peak, the primary source for themes was the Ovi Store, which hosted a large catalog of both free and premium options. Compatibility : Because the C7 shared the Symbian^3 architecture with the

, released in late 2010, was a cornerstone of Nokia's Symbian^3 era , blending a sleek stainless steel design with a highly customisable interface. Because it runs on Symbian^3 (and later Symbian Anna and Belle), "working" with themes is a core part of its identity, allowing users to overhaul everything from icons to menu layouts. How Themes Work on the Nokia C7