How do mobile phones earn phone bills?

There are many ways to earn phone bills by mobile phone, and I probably know the following methods. First of all, you download the mobile phone business hall client, sign in the points every day, and then exchange the points for phone bills. Second, participate in answering questions in Baidu Know-it-all to earn phone bills, and watch videos and send videos in small national videos to get rewards. Third, pay attention to the official WeChat account of your mobile phone number operator in Alipay or WeChat, where operators often push preferential activities. Fourthly, in bonus hunter, you should look for some promotional applications in Baidu App Store or other app stores. In the early stage of general promotion applications, new users are rewarded, most of which are telephone charges. Some small game applications have a phone fee reward, but you are required to recharge, so don't do this, it is risky. I wonder if it will help you.