Google announced today that the feature-phone Googlebot was retired. Google will “not be using the feature-phone user-agents for crawling for search going forward. ” Special sitemaps extensions for feature-phone
In the Webmaster Central Blog, John Mueller, Webmaster Trends Analyst, said that “most websites don’t provide feature-phone-compatible content in WAP/WML any more,” and “given these developments, [Google] made changes in how we crawl feature-phone content.”
Google will still continue to show feature-phone URLs in search, when is possible to recognize these devices/content, and when they’re appropriate for users. The only way to tell to googlebot about the alternative content is o use this small tag on Meta.