1、首先，现在我们手机通信发展快，我们可以下载手机营业厅app，然后登陆点击个人中心-我；2、在我的页面中点击选择已定业务；3、主套餐是不能更改的，我们点击增值业务；4、在增值业务中有的可以退订，如果[详细]
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