Can I reply to the SMS platform without a mobile phone card?

You must use SIM card to send SMS. Short message is text or digital information sent or received directly by users through mobile phones or other telecommunication terminals, which is the number of characters that users can receive and send short messages at one time.

Short message: ShortMessageService, referred to as short message service, refers to the text or digital information directly sent or received by users through mobile phones or other telecommunication terminals. The number of characters that users can send and receive SMS at a time is 160 English or numeric characters or 70 Chinese characters.