Data are kept in the cache according to the HTTP caching rules. In case, no caching controls have been defined, the data are cached until the cache is cleared manually or it is removed because the cache is full.
The cache storing in the client can be controlled using HTTP headers or by having HTTP-EQUIV meta tags in the WML content. If no caching is preferred, it is recommended to use the following meta tag: <meta http-equiv="Cache-Control" content="no-cache"/>