400号码大气、简单、易记，骤然提升企业形象 The 400 number atmosphere, simple and easy to remember, suddenly promoted the corporate image 　　刊登广告，公司宣传，效果立竿见影，广告长期有效 Advertise, the company publicize, the effect is immediate, the advertisement is long and effective 　　对外全国统一，电话不占线，业务不流失，搬家不换号 National unity, the telephone is not engaged, the business is not lost, the move is not changed 　　有效增加来电数量，增加沟通时间，有效留住客户 Effectively increase the number of incoming calls, increase communication time and effectively retain customers 　　主被叫分摊付费，提升品牌同时，避免恶意骚扰 The Lord is called upon to pay to promote the brand while avoiding malicious harassment 　　增加来电机会，有效节省80%办公成本 Increase the chance to call and save 80% of office cost