I changed my Android phone and couldn't send a text message, but I received a text message on my old Apple phone, the old phone.

Receive information through Apple's imessage, and others don't send information through operators. This is similar to your Apple phone without a card, but you can log in to QQ and receive QQ information. Imessage is similar to the sending and receiving function of SMS, but it is a kind of information sent and received through traffic or wifi network. There is no need for operators to send and receive, and there is no need to charge SMS fees.