Yes, you can blind copy someone on a text message for iPhone. This can be done by adding the person's contact details to the BCC field of the message. Here's how to do it:
1. Open the Messages app on your iPhone.
2. Create a new message by tapping on the compose icon.
3. Add the recipient(s) you want to send the message to in the To field.
4. Tap the "+" icon to the right of the To field.
5. Type the contact's name or phone number in the BCC field.
6. Enter your message and hit Send.
It's important to note that the BCC field is only available in group messages. If you're sending a message to a single recipient, the BCC field won't be visible.