There are a few ways to add a signature in text message on Android. The first way is to use the built-in signature feature of the phone. To do this, open the messaging app and type in your name and email address into the text box at the top of the screen. Then, click on the Add Signature button. The second way is to use a third-party application. If you want to add a signature using an application other than Google Messenger, you will need to find and install that application. Once you have installed the application, open it and type in your name and email address into the text box at the top of the screen. Then, click on the Add Signature button. The third way is also available if you don’t want to use Google Messenger or another messaging app. You can also add a signature by using an online service such as Facebook or Twitter. To do this, you will need to sign up for that service and then create an account with that service. Once you have created an account with that service, type in your name and email address into the text box at the top of the screen and then click on Add Signature.