Is there no data link to receive SMS?

Yes, SMS and data connection are not together. At the beginning, many mobile phone cards are cards that can't access the Internet, so sending text messages and making phone calls is the basic function of mobile phones. Receiving SMS has nothing to do with data connection. Unless you use some network software applications to send information, the received information needs to be recycled, that's all. Otherwise it's okay.

I hope it helps you. thank you