Can I Send a Text Message Without Showing My Number?

From the Web
Text messages can be sent anonymously and for free from cell phone provider websites. It is important to visit the website of the cell phone provider of the person you are trying to text. For example, if your friend uses Verizon Wireless, you would visit text.vzw.com to send a text message. You can leave the 'from' field empty to make it anonymous!
Free Anonymous Text Websites
Some free text messaging websites allow for anonymous texts to be sent. Examples include AnonTxt.com, TxtForFree.net, and FakeMyText.com. These websites allow you to send text messages to any cell phone without displaying your cell phone number.
Send Anonymous Texts from iPhone
If you have an iPhone, you can send anonymous text messages from your cell phone using an iPhone application. One application that allows users to send messages anonymously is SMSveil. After purchasing this application, iPhone users can send unlimited anonymous text messages.