The cheapest is Tietong, but it has limitations. There are many places where there are no lines connecting Tietong.
The most suitable is that the telecom speed can be at a reasonable price of one year 1 megabit, and 500 yuan is also free of the initial installation fee.
If you have money, of course, you still use Netcom.
If it is economical and practical, of course, use telecommunications.