Not so - the data could be transmitted to (and embedded within) the data-packets sync-ing to cell-towers, matched by user [IMEI number] at some telecom facility and then sent to the feds. In such a setup no "target address" [IP or otherwise] would be needed.
You are talking about data that has already left the iPhone and is in someone else’s hands — and that wasn’t what I was talking about. You’ll see I specifically mentioned this.
Quoting myself ...
Data you create yourself and send out onto the Internet are things like a phone call you make, a text message you send, an e-mail you send, a face-to-face video call you make, etc.
With all that, you INTENTIONALLY and with purpose SENT THAT DATA out onto the Internet. Once it’s “on the Internet” someone else can snag that data. That’s not a security risk or problem with the iOS device, because the data is being snagged apart from the iOS device and far away from it. THAT is definitely going on ... and that has been amply reported. That’s not a defect in the iOS device.