Even if you do not own a cellphone or do not have access to yours, you can still send a text message. As a Yahoo! Mail user, you can send a text message in the form of an email to any cellphone that is capable of receiving a text. Sending a text message from your email account allows you to avoid overages if your cellphone plan includes a limited number of text messages.
Open a browser window and navigate to your Yahoo! Mail account. Log in with your ID and password.
Click "New" and select "Email Message" from the drop-down menu.
Enter the recipient's mobile phone number followed by "@" and the SMS gateway in the "To" field. The SMS gateway works in the same manner as the domain in an email address. An example email address for a Boost Mobile cell phone customer is firstname.lastname@example.org.
Type the text for the message in the body of the email. Messages longer than 160 characters may be received in several messages or truncated.
Click "Send" and your text message will be sent to the recipient's cellphone.
Locate the recipient's cellphone service provider using an online search tool such as White Pages or Fone Finder.
Use Email-Unlimited's list of SMS gateway providers to find a cellphone service provider's SMS gateway.