4G升级5G，到底是需要换手机还是SIM卡？知情人道出了实情
我们今天一起来看一下手机升级之后的变化，升级后的变化，对于用户而言最大感受就是下载速度超快，比如下载一部高清电影可能需要10分钟时间，到时在5G的网络中总流量不变的情况下下载时间可以减少到1分钟左右。另外，5G的最大改变可能是对社会生活的影响，因为5G的主要应用场景不是速率的高低，而是物联网的全面使用。到时切片形式的不同应用场景，我们的社会生活可能会迎来质的改变。比如说无人驾驶、VR应用，平日里随处可见的灯杆、井盖、烟雾感应器等联网以后随时可实现移动终端的实时监控等等。
再来看一下，过去我们2G升3G或者3G升4G的时候需要换SIM卡，是因为早期的SIM卡很容易被复制，不安全。所以三大运营商就趁着网络升级的当口，给用户升级成了更加全的USIM卡。这种USIM卡自带处理器芯片，加密等级很高，几乎无法被破解。目前还没有比USIM卡更高级别的SIM卡，所以理论上升级到5G网络之后，仍然可以继续使用USIM卡上网。至于现在的4G手机肯定是无法使用未来的5G网络的，因为5G网络是一个全新的技术标准，而现有的4G手机处理器基带是按照过去的4G标准研制的，在硬件上就有根本的区别。比如现有的高通骁龙845处理器、华为海思麒麟970处理器，都达不到5G网络标准。所以即使4G手机插上支持5G的SIM卡，也只能使用4G网络，而无法使用5G网络。
最后我想说的就是，手机换手机卡后不会有什么变化,需要换了5G手机后才会感觉到网路的变化，5G网络作为第五代移动通信网络使用，它的峰值理论传输速度可达每秒数十Gb，这要比4G网络的传输速度快数百倍，下载整部超高画质电影可在1秒之内完成。5G时代我们可以用智能终端分享3D电影、游戏以及看超高画质（UHD）的节目。5G时代还是很值得期待的，但时候我们就彻底摆脱有线的束缚，随时随地看视屏玩游戏，5G将会再一次的改变我们的周围世界，我们的生活方式。
也欢迎大家互相交流讨论一下。
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