ContributionsMost RecentMost LikesSolutionsRe: How Do I Find Out If I Have Been Switched To CV21 ? No dial tone on landline, can't make or receive calls, intermittent problem initially now all the time. How Do I Find Out If I Have Been Switched To CV21 ? My landline has stopped working, have I been switched to CV21, if so how do I find out? I haven't received a letter or adaptor to my knowledge.