How to send a message to Apple for free?

The reason is that you use Apple's imassage service. This service is similar to qq, with e-mail address as account and Internet as communication mode. The advantage is that you can send the read receipt and synchronous chat records on multiple devices of the same person (exactly the same apple id), and it is free (sometimes the traffic will be deducted, but it is absolutely free in the case of wi-fi). Even if you don't make a phone call, other apple devices can receive this short message. As for why your wife can receive the same text message, the reason is that Apple automatically synchronizes chat records for the convenience of multi-device users. The solution is simple: Method 1: Turn off imassage in Settings → Information, so that this will not happen in the future, but you will send paid text messages in the future. Method 2: In the settings, cancel the original ID and reset an apple ID. If you think this method solves your problem, please choose it as the best answer. If you have any questions, please feel free to ask them, and I will answer them for you as soon as possible. Thank you.