5G时代来了，你需要更换手机么？别急着购买5G手机！
12月3日，韩国三星与美国威瑞森联合宣布，将在2019年上半年销售5G智能手机，摩托罗拉和 one plus 也将推出数款5G智能手机，各类媒体争相报道5G时代的到来。但是国内三大运营商的5G网络的商用一再延期，5G真的能极大地改善全社会吗？
2019年的5G手机是一定会发布的，但是相比真正意义上的5G来说也许没有办法发挥百分之百的5G实力。原因很简单，粗略的说任何通信都是端到端多方面的通信互联，现在5G手机只能算是一个终端，还需求其他诸如运营商基带等端口支持才可以。
在4G时代，我们已经习惯了“全网通”手机的存在。一部手机就能够完全支持中国移动、中国联通及中国电信的网络制式，人们可以随意选择运营商。但是在5G时代，刚开始阶段就购买到“全网通”手机或许是不可能的。这是因为，5G技术本身存在特殊性。
5G网络主要运用两种技术规格，Sub-6GHz的低频段通讯及24GHz以上的高频毫米波（MmWave）。这两种频段所运用的技术有很大区别，所针对的使用场景存在差异。对于初期的5G手机来说，支持Sub-6GHz频段基本就能满足使用。而随着技术发展成熟、成本降低后，兼顾两种频段的多模支持才有望成为大趋势。
而从另一个角度看，5G技术的特殊性意味着手机厂商在5G发展初期，必须为每个运营商定制手机。因为每个运营商都有自己的计划，去构建MmWave、Sub-6GHz或者两者的组合。如果手机与精确的网络频段不匹配，则无法在运营商上运行。这样一来，手机厂商不得不为单个运营商制作定制手机。
5G时代来了，你需要更换手机么？
很多网友在问这样的问题，答案是不一定。目前的手机确实都不支持5G网络，想用5G网络必须换。但在5G网络初期，4G网络并不会被淘汰。甚至很多时候很多地方，5G没信号了，4G还有。就如同现在有些4G网络没有覆盖到的地方，手机还是会自动连上2G网络。并且这样的状态会持续很长一段时间，要想5G完全覆盖，那真的还太早太早了。
虽然中国移动宣称在2019年第三季度可以建成可商用化的5G网络，但覆盖程度怎么样，你们小区是否有信号，可是没有说。至少以普通人的换机周期来看，平均都是在大约一年半的时候换新机。很可能现在购买一台4G手机，到你该换手机的时候，5G都还没普及呢。
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