Will the other party know if my iPhone intercepts text messages?

The other party will not know if your iPhone intercepts text messages. According to the query of relevant information: Apple's mobile phone intercepts text messages, but the phone will not actively remind you that the other party has incoming text messages, but it does not affect the other party's sending of text messages. Only you know about intercepted text messages. After intercepting a text message, the phone will add it to the blacklist and will be reminded of the intercepted message, but the content of the text message will not be visible.