How to Set Up Text Message Signatures on a Cell Phone. Although email signatures are commonplace, many people do not realize that they can add a signature to text messages as well.

A text message can be thought of as a kind of short e-mail — 160 characters or fewer including spaces — that is most commonly sent to another cell phone for that person to read.

Text (SMS) messages should be ... can be installed on Android phones as well as iPhones. ... Open the app drawer on your Android device and tap the "Google Voice" icon to launch the app.