Why did my wife's iphone receive other people's information, but my iphone did?

If the other party is also using an iPhone, it is very likely that the imessage function of the iPhone has been turned on. At this time, the iPhone sends messages to the iPhone without sending text messages. The principle is the same as QQ. Your wife should use the Apple account with you. See if the color of the message is blue. Blue means using imessage. Just turn off imessage in Settings-Info.