Why can't I delete text messages on my iPhone?

Find the delete button, and tap on it. It should delete it, which will remove it from your documents folder.

First, open the specific message you want to delete and press on it with our finger. A small menu will appear. From there, click "More," then on the bottom left...

Siri cannot do this unless you ask her and you know the person and the exact date of the conversation.

There isn't a built-in way to hide existing text messages in iOS, but you can search for apps that will hide your messages by typing "Hide Texts" into the app...

Take a screen shot, then go to photos and click the button on the left corner then click print.

The user either blocked you (which you can tell if you cannot follow the user's account) or disabled the sending of direct messages (DMs).

No because they are different devices.

You can send a photo and tell the other person that it reminds you of them. Or share a song that made you think of them.