Which is cheaper, mobile card or Unicom card, to send short messages to telecom mobile phones?

Telecom estimates that you are talking about sending messages in the mobile dynamic zone. I think it should be cheaper, but it depends on your personal needs. For example, some cards contain as much information as wallets. For example, the Unicom card I am using now flows to 20 yuan, and 50 messages are free. It is cheaper to answer the phone and send messages in the dynamic zone with 500M Internet traffic. These are all packages, that is, how much is the package, and then how much is the free information. You can go to the mobile business hall or Unicom business hall to choose the card that suits you.