400电话是一种主被叫分摊付费电话业务。该业务为企业提供全国统一的以400开头的10位全国直播号码。可实现把对该号码的呼叫转接至预先设定的电话号码或呼叫中心上，并由主叫方承担本地通话费，被叫的企业按主叫用户实际发话位置付本地或长途话费。
400 telephone is a kind of service that the main and the called share the payment. The business provides enterprises with a national unified 10 digit national live broadcast number starting with 400. It can transfer the call to the preset phone number or call center, and the calling party shall bear the local call fee. The called enterprise shall pay the local or long-distance call fee according to the actual calling position of the calling user.
400电话采用了符合中国国情的资费分担业务模式，加之资费低廉并且手机可拨打，现在已经被各类企业广泛应用于市场营销、技术支持、客户服务等领域，成为企业提升形象，改善服务的重要手段。
400 telephone has been widely used in marketing, technical support, customer service and other fields by all kinds of enterprises. It has become an important way for enterprises to improve their image and service.