When you create a signature, it is attached to all SMS you send. Please note that the characters of the signature counts as characters of the SMS.
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You can create and change your signature in the message settings.

If you have saved your signature, it is automatically pre-entered in the text input field when you write a new SMS. You can delete the signature at any time in the input field.
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If you do not want the signature to be displayed at all anymore, delete it in the field in which you created it. Simply remove the text from the signature field and save the settings