How Do I Send Anonymous Text Messages From A Cell Phone?

Often times you can use the carriers website.... Along with the recipient's phone number to send a text w/o using a callback number.

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You'll need a web browser on your phone, but you can go to www.fivedigittext.com to send an anonymous text.  You can also use it from a PC, but if your phone has a browser, you can do it right from the phone.  It's fast, easy, and free.

Www.fivedigittext.com

Depends on where you are. If in the USA, go to your local Walmart and buy yourself a Tracfone. Register it from a telephone number neither at your home or workplace, and text away. In the rest of the world, buy a SIM card, or steal someone else's if the local government forces you to register. Then text away.