电信联通的400电话从语音传输质量、资费及号码资源综合比较是最适合中小企业的。不但服务稳定，且资费优惠，号码资源十分充足。由于4008电话和4009电话同是电信运营商，4000电话和4006电话同是联通运营商，质量服务上都有保障，只是号码段的不同。无论是开号速度、号码资源，还是信号质量、市场占有率、覆盖率等，电信联通400电话是综合表现好的运营商，也是最值得企业拥有和信赖的产品！
Telecom Unicom's 400 telephones are most suitable for small and medium-sized enterprises from the comprehensive comparison of voice transmission quality, tariff and number resources. Not only is the service stable, but also the fee is preferential, and the number resources are abundant. Because 4008 and 4009 are both Telecom operators, 4000 and 4006 are both Unicom operators, and their quality and service are guaranteed, but the number segments are different. Whether it is the opening speed, number resources, signal quality, market share, coverage, etc., Telecom Unicom 400 telephone is the best comprehensive performance of operators, but also the most worthy of enterprise ownership and trust products!