To forward a text message on an iPhone, follow these steps:

1. Open the Messages app and find the conversation with the message you want to forward.
2. Tap and hold the specific message until a menu appears.
3. Select "More" from the menu.
4. Tap the forward arrow icon (a curved arrow) at the bottom right corner.
5. Enter the recipient’s phone number or select a contact.
6. Edit the message if needed, then tap send to forward it.

You can also select multiple messages to forward by tapping each after choosing "More" before tapping the forward icon

. For automatic forwarding to other Apple devices, you can enable Text Message Forwarding in Settings > Messages > Text Message Forwarding and select devices allowed to send and receive messages from your iPhone

. If you want to set up automatic forwarding to other platforms (like email or Slack), you can use the Shortcuts app with automation and third-party apps like Forward SMS to create custom forwarding rules

. In summary, manual forwarding is quick and easy via the Messages app, while automatic forwarding requires setup in Settings or Shortcuts depending on your needs.