Can't telecommunications and wireless broadband be used for online phone calls, text messages and other functions?

The Tianyi network card you bought is the same as the phone card. If you switch to your own Tianyi mobile phone card, it won't work. The client can't pass the test unless the system is changed in the business hall. When you say Tianyi LIVE 1X network, you mean the 2G network of telecom. Tianyi LIVE can only use 2G network and 3G network, and it's just like plugging in a PHS card. You said that the system verification failed when Tianyi LIVE plugged in the 3G network card.