What is the cheapest way to run a mobile phone business after studying in France for six months?

There are many cheap telephone companies in France, such as zero, or Virgin also has cheap packages. Many telecom companies pay 9.9 Euros per month, unlimited text messages, and talk for one hour. If you don't want a new mobile phone, it is basically unbound. You can unsubscribe if you want to return it. There are only small mobile phone telecom operators in China, because there are many domestic telecom operators, and sometimes it is not guaranteed to be free. However, the landline has a 29.9 package TV phone and internet, which can't be opened or bought. Therefore, if you want to make a domestic call, you can only use VoIP or apply for a landline package, which is about 30 yuan per month.