在选择400电话套餐时除了要关注前面说的费用和功能外，还有就是要注意一下套餐的合约年限，目前市场上大多数的400电话业务套餐合约年限都是3年，虽然说企业也可以选择按单年进行申请400电话办理业务，但是这种方案基本上都是没有任何的优惠的，平均下来的话每年的收费一般会比3年的套餐贵那么一点，而且一般的长期套餐都会比短期套餐有明显的优势，所以企业在挑选服务商时要谨慎，一旦确定了可靠的代理商还是选择一个长期的套餐比较好，这样才能做到既能省心又能省钱。
In choosing 400 telephone packages, besides paying attention to the aforementioned costs and functions, there is also a need to pay attention to the contract life of the packages. At present, most of the 400 telephone service packages in the market are for three years. Although enterprises can also choose to apply for 400 telephone services in a single year, this kind of scheme is basic. On average, the annual fee will be a little more expensive than the three-year package, and the general long-term package will have obvious advantages over the short-term package. Therefore, enterprises should be cautious in selecting service providers. Once reliable agents are identified, they should choose a long-term package comparison. Okay, that's how you can save money as well as worry.