You can manage your SMS from your computer with Lazy Panda for iPhone.
To use SMS Management function, you should connect your iPhone to your computer and run Lazy Panda for iPhone. Click the Management button, then click on the SMS icon to enter the SMS Management interface.
You can check your chat history from the left column under SMS.
Click a contact name or phone number, then the conversations between you and that contact will appear in the center of the interface. You can Resend, Edit or Delete any message by clicking the appropriate button on the right side of the interface.
Click on the Resend button, then there will pop up a SMS Chat window. Choose the contact(s) to whom you want to send a message from the contact column, type in the message you wish to send to your contact(s) and hit Send.
Click on the Edit button, an Edit column will appear at the bottom of the interface, and you can start to modify the selected message from your computer. After the edit, click Confirm to save your modification.
Click Delete, and you can delete an individual message.