Mobile phones don't open text messages

Classification: Electronic Digital; Other digital products

Problem description:

My friend's mobile phone has no SMS function. Can I receive messages from others?

I seem to have tried it when I just bought my mobile phone before. I can answer it but I can't send it. I don't know if it's good now

Urgent question, thank you:)

Analysis:

I'm sure I can't send it without opening it, but I doubt it will get an answer.

But it seems to open automatically, hehe.