手机用4G上网时，这个功能一定要关掉，否则多少流量都不够用
手机只是用来聊聊微信，刷刷微博，感觉没做什么流量就没了，而且还越来越卡，这是为什么呢？罪魁祸首可能就是——APP在后台偷偷运行，消耗你的流量，还占用手机内存以至于让手机越来越卡。通过设置将手机当中【APP后台运行】的功能给关掉，每个月就可以省出不少流量了，且手机运行也会更流畅。
不同品牌型号的手机设置的方法会有所差异。华为手机的的设置方法是：打开手机自带的【手机管家】，点击【应用启动管理】，然后选择你想限制其在后台运行的应用，将【允许自启动】、【允许关联启动】、【允许后台活动】三个选项全部关闭即可。
魅族手机的设置方法则是：打开手机自带的【手机管家】，点击【权限管理】-【后台管理】。
然后选择你想限制其在后台运行的应用，选择【禁止后台运行】即可。
有的手机则是在【设置】-【应用管理】-【授权管理】-【自启动管理】当中，总之设置方法大同小异。
当然，除了这个方法之外，你也可以在手机的【设置】-【系统】-【开发人员选项】当中，找到【后台进程限制】，根据自己的需求设置最多允许多少个APP在后台运行。
有一些APP我们可能一个星期，甚至是一个月才用一次的，卸载吧，要用时没有很麻烦，留着吧，手机里一大堆APP，十几个甚至有几十个去，这些应用在你没有用时，甚至以为自己已经将它彻底关闭了时，也可能会在后台默默的运行，消耗你的手机流量，浪费你的电量，还占用你的手机内存。对于这一类不常用的应用，强烈建议大家设置一下。
再跟大家唠一个教授使用手机的习惯，这个习惯源于流量一直以来都不便宜。教授每次在手机上装某款应用时，特别是消耗流量特别多的视频类APP时，会顺手将其使用移动数据的权限给关掉。关闭的方法要么是在【设置】-【应用联网】当中，要么是在【手机管家】-【流量管理】-【应用联网】当中。
这样简单的设置一下，该APP就只能在wifi状态下运行，也就消耗不到流量啦。
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