一、IP电话卡的选择目前,上市的IP卡分为记帐卡(A类)、预付卡(B类)、面值卡(C卡)三种。其中记帐卡按月付费,无面值,可以挂失。只要按期缴费,无有效期限制。一般为公司、企事业单位使用;预付卡无面值,可以挂失,需要预付话费,也可续费,长期有效。可以取消并退回卡内余 First, the choice of IP phone card At present, the IP cards listed are divided into debit card (A class), prepaid card (B class), face value card (C card) three. Which charge a monthly bill, no face value, you can report the loss. As long as the payment on schedule, there is no deadline. Generally for companies, enterprises and institutions use; prepaid card no face value, you can report the loss, the need to prepaid calls, you can renew, long-term effective. You can cancel and return the card remaining