You can use a text signature in your text messages as you would in e-mail. To use a text messaging signature, you first have to create one.
Step 1
Tap Start > Messaging, and then scroll to Text Messages.
Step 2
Tap Menu > Options > Signatures.
Step 3
In the Select an account field, make sure that Text Messages is selected.
Step 4
Select the Use signature with this account check box.
Step 5
Select the Use when replying and forwarding check box, if you want.
Step 6
Enter your signature and then tap OK.
The signature will appear the next time that you send a text message.