随着电话卡在日常通讯生活中的普及,关于有效期届满后卡内余额是否应该退还给消费者的争论也在不断增多。本文从电话卡及期满后余额的性质界定入手,对当前关于余额处理的几种观点进行了分析,指出运营商对有效期届满的电话卡卡内余额的占有构成不当得利,并提出了处理卡内余额的具体建议。 With the popularity of calling cards in everyday communication life, the debate over whether the card balance should be returned to consumers after the expiry of the validity period is also on the rise. Starting with the definition of the nature of the balance between calling card and post-expiration, this paper analyzes several current views on the balance-handling and points out that the operators have unjust enrichment in the possession of the remaining balance in the calling card. Specific advice on balances.