常用手机的人往往会碰到这样的问题：当你正在兴致勃勃地通话时，突然通话停止，显示你非常生气，但却弄不清是咋回事儿。实际上，这也是移动通信公司的一项技术难题，虽然制造公司在这个技术上已竭尽全力，但遗憾的是，这一难题没有得到彻底地解决。现在我们就具体地分析一下 People who use mobile phones often encounter such a problem: when you are talking spiritedly, stop talking suddenly, show you very angry, but it is unclear what is going on. In fact, this is also a technical problem for mobile communications companies. Although manufacturing companies have done their best in this technology, it is regrettable that this problem has not been completely solved. Now we will analyze it concretely